Outback Bloomin’ Onion Recipe (Copycat Fried Onion)

I have ordered the Bloomin’ Onion at Outback Steakhouse more times than I can count, and every single time I watched it arrive at the table I thought – I need to figure out how they do this at home. After about eleven test batches spread over two weekends, I finally cracked it. The secret is a double-dip in the egg wash and batter, keeping your oil at exactly 375 degrees Fahrenheit through the whole fry, and – this is the one most copycat recipes skip – soaking the cut onion in ice water for a full 30 minutes before battering. That soak opens the petals, removes harsh sulfur compounds, and lets the batter adhere in one even coating. My family did a blind comparison against a takeout order and they genuinely could not tell the difference.

This recipe takes about 90 minutes from start to finish, including the crucial soak time. Total hands-on work is maybe 25 minutes. Ingredients cost around $8 to make at home versus $12 to $14 at the restaurant. Each full Bloomin’ Onion serves 4 people as a shared appetizer. Difficulty is Medium – the cutting technique takes a little practice but I walk you through it step by step below.

Why You’ll Love This Recipe

• Identical crispy petals to the restaurant version at a fraction of the cost
• The dipping sauce comes together in 5 minutes and tastes exactly like Outback’s
• You control the oil temperature so every petal fries evenly – no soggy spots
• Great party appetizer that looks incredibly impressive with almost no effort
• Ice water soak trick makes the onion flavor sweet and mild instead of sharp

About This Multi-Brand Favorite

The Bloomin’ Onion was introduced by Outback Steakhouse when the chain launched in 1988 in Tampa, Florida. The founders drew heavily on an Australian theme – hence the name Outback – though the Bloomin’ Onion itself is a purely American invention with no direct Australian counterpart. It became the restaurant’s signature appetizer almost immediately, and by the mid-1990s Outback was selling millions of them every year. The dish is a single large sweet onion, typically a Vidalia or Texas Sweet, cut into a flower shape with anywhere from 12 to 16 petals, battered in a heavily seasoned coating, and deep fried until golden. It is always served with Outback’s proprietary dipping sauce, a creamy horseradish-forward blend with paprika and cayenne. For decades Outback guarded the exact recipe, but through careful reverse engineering and many rounds of testing, the home copycat community has come extremely close to nailing both the batter seasoning ratios and the dipping sauce formula.

Ingredients

For the Onion

• 1 very large sweet onion (Vidalia or Texas Sweet, at least 4 inches diameter)
• 2 cups all-purpose flour
• 1 teaspoon salt
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1 teaspoon paprika
• 1/2 teaspoon cayenne pepper
• 1/2 teaspoon black pepper
• 1/2 teaspoon dried oregano
• 1/2 teaspoon dried thyme
• 1/4 teaspoon cumin

For the Dipping Sauce

• 1/2 cup mayonnaise
• 2 tablespoons sour cream
• 2 tablespoons prepared horseradish
• 1 teaspoon ketchup
• 1/4 teaspoon paprika
• 1/4 teaspoon garlic powder
• 1/8 teaspoon cayenne pepper
• Salt and black pepper to taste

For Battering and Frying

• 2 large eggs
• 1 cup whole milk
• 4 to 6 cups vegetable oil for deep frying
• Ice water for soaking (enough to submerge onion)

Ingredient Substitutions

• Yellow onion works if you cannot find a Vidalia – just expect a sharper flavor
• Buttermilk instead of whole milk adds subtle tang and helps batter cling better
• Smoked paprika instead of regular paprika adds a pleasant smoky note
• Canola or peanut oil works equally well for frying if vegetable oil is unavailable
• Light mayo can replace regular mayo in the dipping sauce to reduce calories slightly

Equipment You’ll Need

• Large deep pot or Dutch oven for frying (at least 6 quart)
• Deep fry or candy thermometer
• Large bowl for ice water soak
• Two shallow bowls for batter and egg wash
• Spider or large slotted spoon for lowering onion into oil
• Wire rack set over a baking sheet for draining

Step-by-Step Instructions

1. Make the Dipping Sauce. Whisk together mayonnaise, sour cream, horseradish, ketchup, paprika, garlic powder, and cayenne in a small bowl until fully smooth. Taste and adjust salt and pepper. Cover and refrigerate for at least 30 minutes before serving – this rest time is important because it lets the flavors meld and the horseradish heat bloom properly. The sauce can be made up to 3 days in advance and kept covered in the refrigerator.
2. Cut the Onion into a Bloom. Cut off the top stem end of the onion by about half an inch, leaving the root end fully intact – the root holds all the petals together during frying. Peel the onion. Place the onion cut-side down on your cutting board. Starting about half an inch from the root, make 4 evenly spaced cuts down through the onion to the cutting board, creating 4 sections. Then make 3 additional cuts in each section so you have 16 cuts total. Gently turn the onion over and use your fingers to carefully spread the petals apart without tearing them from the root.
3. Ice Water Soak. Place the bloomed onion cut-side down in a large bowl and cover completely with ice water. Add a handful of ice cubes. Let it soak for 30 full minutes. Do not skip or shorten this step. The cold water causes the onion to open up further, firms the petals so they hold their shape during frying, and draws out the sharp compounds that would otherwise make the finished dish taste harsh. After soaking, lift the onion out and shake off excess water, then pat gently with paper towels.
4. Prepare the Batter. Whisk together flour, salt, garlic powder, onion powder, paprika, cayenne, black pepper, oregano, thyme, and cumin in a large shallow bowl until evenly combined. In a second shallow bowl, whisk together eggs and milk until smooth. Set both bowls next to your frying station. The batter needs to be applied in two stages – flour first, then egg wash, then flour again – to build the thick coating that gives the Bloomin’ Onion its signature crunch.
5. Double-Batter the Onion. Hold the onion over the flour bowl and spoon flour generously into the center, then tilt and shake to coat all the petals thoroughly. Tap out any excess. Dip the entire onion into the egg wash, making sure the wash penetrates between all the petals. Let the excess drip off for about 10 seconds. Return the onion to the flour bowl and coat again, pressing flour into every crevice between petals. This double coat is what creates the thick, crunchy shell.
6. Fry the Onion. Heat oil in your Dutch oven to 375 degrees Fahrenheit – use a thermometer and do not guess. Carefully lower the battered onion into the oil cut-side up using a large spider or slotted spoon. Fry for 4 to 5 minutes until deep golden brown. Flip the onion carefully using two large spoons or tongs and fry cut-side down for another 3 to 4 minutes until the petals are uniformly golden. The total fry time is 7 to 9 minutes. Monitor oil temperature throughout and adjust heat to keep it at 375.
7. Drain and Serve. Lift the finished onion out of the oil and place it cut-side down on a wire rack for 2 minutes to drain. Transfer to a serving plate and immediately season with a light pinch of salt. Place a small bowl of the dipping sauce in the center of the bloom where the onion opens. Serve immediately while hot and crispy – the Bloomin’ Onion loses its crunch quickly as steam from the onion softens the batter, so plan to eat it within 10 minutes of frying.

Pro Tips from My Kitchen

• Your onion must be at least 4 inches in diameter – a small onion will not bloom properly and the petals will be too thin to hold batter
• Use a thermometer every time – oil that is too cool (below 360) makes the onion greasy and dense; oil above 390 burns the outside before the inside cooks
• If your Dutch oven is small, the onion may not be fully submerged; ladle hot oil over the top half during frying to ensure even cooking
• Let the egg-washed onion drip for a full 10 seconds before re-dipping in flour or the second coat will slide off
• Refrigerating the battered onion for 10 minutes before frying helps the coating set and adhere even better
• Make the dipping sauce the night before – the flavor improves dramatically overnight as the horseradish mellows and integrates

Recipe Variations

• Spicy Bloomin’ Onion – double the cayenne and add 1/2 teaspoon chipotle powder to the flour mixture
• Air Fryer version – spray battered onion heavily with cooking spray and air fry at 400 F for 20 to 22 minutes, flipping halfway
• Beer Batter Bloomin’ Onion – replace the egg and milk wash with 1 cup cold light lager for extra crunch
• Gluten-free – substitute a 1-to-1 gluten-free flour blend; results are very similar
• Ranch Bloomin’ Onion – add 1 tablespoon dry ranch seasoning mix to the flour for a different flavor profile

Common Mistakes to Avoid

• Using a small onion – the Bloomin’ Onion needs a large sweet onion or the petals will be too thin and will burn before the batter crisps
• Skipping the ice water soak – this step is non-negotiable for proper petal separation and mild flavor
• Frying at the wrong temperature – check with a thermometer before and during frying; low oil makes it greasy
• Only battering once – a single coat produces a thin shell that falls off; the double-dip technique is essential
• Not serving immediately – even 15 minutes on the counter will make the batter go soft from internal steam

What to Serve With This Dish

• Outback-style sirloin steak with seasoning rub (recipe on this site)
• Alice Springs Chicken for a complete Outback experience
• Cold draft beer – the slight bitterness cuts through the fried richness perfectly
• Additional dipping sauces: ranch, sriracha mayo, or blue cheese
• Simple green salad to balance the richness of the fried appetizer

Storage Instructions

Refrigerator

Store leftovers in an airtight container for up to 2 days. The batter will soften significantly but the flavor remains good.

Freezer

Not recommended – the batter becomes very soggy upon thawing and does not recover even with reheating.

How to Reheat

Reheat in an air fryer at 375 F for 5 to 7 minutes or in an oven at 400 F for 8 to 10 minutes on a wire rack. This restores most of the crispiness.

Make Ahead

Cut and soak the onion up to 4 hours ahead and keep submerged in ice water in the refrigerator. Make the dipping sauce up to 3 days ahead. Batter and fry just before serving.

Nutrition Information

Per serving (estimated): 235 calories, 5g protein, 32g carbs, 10g fat (2g saturated), 2g fiber, 5g sugar, 480mg sodium.

Nutrition values are estimates and will vary based on exact ingredients used.

Frequently Asked Questions

What kind of onion does Outback use for the Bloomin’ Onion?

Outback uses large sweet onions, most commonly Vidalia or Texas Sweet varieties. These onions are milder, have a higher sugar content that helps the batter brown evenly, and are large enough to create the dramatic bloom shape. A regular yellow onion will work in a pinch but will taste sharper. Look for onions at least 4 inches in diameter – size matters for this recipe.

Why does my batter fall off during frying?

The most common cause is skipping one of the double-dip steps. You must go flour, then egg wash, then flour again – each layer needs to fully adhere before you add the next. Also make sure your oil is at exactly 375 F before lowering the onion in. Oil that is too cool allows the batter to slide off before it sets. Patting the onion dry before battering also helps the first flour coat stick.

Can I make the Bloomin’ Onion in an air fryer?

Yes, and it works quite well. Batter the onion exactly as described, then spray very generously with cooking spray or brush with oil, making sure to coat all the petals. Air fry at 400 F for 20 to 22 minutes, flipping carefully halfway through. The result is not quite as golden and puffy as the deep-fried version but is still very crispy and a lot less messy. Use a basket-style air fryer with at least a 5-quart capacity.

What oil is best for frying the Bloomin’ Onion?

Vegetable oil, canola oil, or peanut oil all work excellently. You want an oil with a high smoke point (above 400 F) and a neutral flavor that does not compete with the seasoned batter. Avoid olive oil – it has too low a smoke point and a distinct flavor. Peanut oil is the professional fryer’s choice for its clean flavor and high smoke point, but canola is more economical and produces equally good results.

How do I cut the onion without it falling apart?

The root end of the onion is your anchor – never cut through it. Place the onion cut-side down with root pointing up. Make your first 4 cuts starting half an inch away from the root and going straight down. Then make 3 more cuts in each section to reach 16 total. Work slowly and deliberately. If a petal breaks off, you can press it back in place before battering. A sharp chef’s knife makes this much easier than a dull blade.

What is in the Outback dipping sauce?

The Outback dipping sauce is a horseradish cream sauce with mayonnaise, sour cream, prepared horseradish, a small amount of ketchup for color and sweetness, paprika, garlic powder, and cayenne for heat. The ratio that matches the restaurant version closest is heavy on mayo and horseradish with just enough cayenne to give a mild burn. Letting it rest in the refrigerator for at least 30 minutes is essential to let the flavors come together.

Can I batter the onion ahead of time?

You can batter the onion up to 30 minutes before frying and keep it in the refrigerator on a wire rack. This actually helps the coating set and adhere better. Beyond 30 minutes the egg wash starts to dissolve the flour coating and you will lose crunch. The onion itself can be cut and soaked in ice water in the refrigerator for up to 4 hours before battering – that part can be fully prepped ahead.

My Bloomin’ Onion turned out soggy – what went wrong?

Sogginess is almost always an oil temperature problem. If the oil is below 360 F when the onion goes in, it absorbs oil instead of forming a crust quickly. The temperature also drops when you add the cold onion, so start slightly higher at 380 to 385 F to compensate. Also make sure you are using enough oil – the onion needs to be nearly submerged. Finally, drain on a wire rack, not paper towels, which trap steam.

How many calories are in a homemade Bloomin’ Onion?

A homemade Bloomin’ Onion with dipping sauce contains approximately 880 to 950 calories for the whole appetizer, or about 220 to 240 calories per serving when shared among 4 people. The restaurant version is estimated at around 1,950 calories for the full appetizer. The homemade version is significantly lighter because home cooks typically use less batter and drain more efficiently than a commercial kitchen.

Can I reuse the frying oil?

Yes – let the oil cool completely, then strain it through a fine mesh strainer or cheesecloth into a clean container. Discard any large debris. Store covered at room temperature for up to 1 month or in the refrigerator for up to 3 months. Onion frying does impart a slight flavor to the oil, so it is best reused for other savory frying projects rather than for something delicate like donuts.

What size Dutch oven do I need?

A 6-quart Dutch oven is the minimum for a large Bloomin’ Onion. The wider the pot the better, because a very large onion may not fit in a narrower pot. You need enough depth to hold 4 to 5 inches of oil so the onion is mostly submerged. If your pot is smaller, you can ladle hot oil over the exposed top of the onion during frying to ensure it cooks evenly all the way around.

Is the Bloomin’ Onion vegetarian?

Yes, the Bloomin’ Onion is vegetarian. It contains no meat – just onion, flour, eggs, milk, and spices for the batter, and mayonnaise, sour cream, and horseradish for the sauce. It is not vegan because it contains eggs and dairy. For a vegan version, substitute the egg and milk wash with 1 cup of unsweetened plant milk mixed with 1 tablespoon of apple cider vinegar, and use vegan mayo and coconut cream in the dipping sauce.

More Multi-Brand Copycat Recipes

• All Copycat Restaurant Recipes

Happy cooking,
Julia