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By kcampbell63
Blooming Onion
7 steps
Prep:15min
This classic blooming onion is tender and sweet on the inside and crispy and golden on the outside! Serve it with a sharp dipping sauce for a restaurant-style treat at home.
Updated at: Mon, 04 Aug 2025 22:15:17 GMT
Nutrition balance score
Unbalanced
Glycemic Index
64
Moderate
Glycemic Load
60
High
Nutrition per serving
Calories730.5 kcal (37%)
Total Fat31.2 g (45%)
Carbs93.7 g (36%)
Sugars18.3 g (20%)
Protein18.5 g (37%)
Sodium2747.3 mg (137%)
Fiber4.6 g (17%)
% Daily Values based on a 2,000 calorie diet
Ingredients
2 servings

1yellow onion
large

2 cbuttermilk

1 ½ call-purpose flour

2 tspkosher salt
plus more for sprinkling

¾ tspbaking powder

¾ tspblack pepper

½ tspcayenne pepper

canola oil
for frying

¼ cmayonnaise

1 Tbspketchup

½ Tbspprepared horseradish

¼ tsppaprika

¼ tspkosher salt

⅛ tspblack pepper

⅛ tspdried oregano leaves

cayenne pepper
Instructions
Step 1
For the onion: Trim 1/2 inch from the top (stem-end) of the onion, and peel the outer skin from the onion. Flip the onion over and place it, root-end up, on a cutting board. Trim the dried part of the root. Starting about ½ inch from the root, insert a sharp paring knife into the center of the onion and cut down until the knife meets the cutting board. Repeat downward cuts all the way around the onion, spacing about 1/2 inch apart, for a total of about 16 sections. Be sure the knife cuts are meeting in the middle of the onion, but not going through the root.
Step 2
2 Place the onion in a medium bowl, and use your fingers to gently separate the “petals." Pour the buttermilk evenly over the onion. Cover and chill for at least 1 hour or up to overnight.
Step 3
3 For the dipping sauce: In a small bowl, combine the mayonnaise, ketchup, horseradish, paprika, salt, black pepper, oregano, and cayenne pepper. Cover and refrigerate until ready to use.
Step 4
4 In a large bowl, whisk together the flour, salt, baking powder, black pepper, and cayenne pepper. Set aside.
Step 5
5 In a large (6 to 8 quart) Dutch oven, heat 2 ½ inches of oil over medium heat to 375°F, leaving at least 3 inches of space between the oil and top of the pot. Remove the onion from the buttermilk, allowing the excess to drip off, and place on a rimmed baking sheet. Sprinkle evenly with the flour mixture, separating the “petals” with your fingers to ensure all pieces are evenly coated.
Step 6
6 Lift the onion and flip it, cut side down, gently shaking to remove excess flour. Using a spider or slotted spoon, carefully lower the onion into the oil, cut-side down; fry until lightly browned, 3 to 4 minutes. Carefully flip the onion, and continue frying, until golden brown and crisp, 2 to 3 minutes.
Step 7
7 Using a slotted spoon, transfer the onion to a paper towel-lined baking sheet. Sprinkle the onion with additional salt. Serve hot with dipping sauce.
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