There are onion rings, and then there are these onion rings. This recipe elevates a classic bar snack into a study in texture and flavor layering, thanks to a double dose of onion—both in the rings themselves and in a silky, homemade mayonnaise infused with the deep, caramelized essence of fried onion. The secret lies in reserving the fragrant oil left after cooking onions; that golden, aromatic liquid becomes the backbone of a condiment so good you’ll want to put it on everything. Crisp, airy panko breadcrumbs and a light, tempura-style batter ensure each ring shatters beautifully, while the mayonnaise offers a rich, savory counterpoint. This is the kind of dish that transforms a simple appetizer into a conversation starter.
About This Recipe
Born from the Russian culinary tradition of making the most of every ingredient, this recipe for onion rings with onion mayonnaise is a masterclass in resourcefulness and reward. The technique is inspired by the practice of “onion oil”—the flavorful byproduct of frying onions that is often discarded. Here, it becomes the star of a quick, immersion-blender mayonnaise that requires no egg yolks and comes together in minutes. The rings themselves are coated in a delicate batter made with cornstarch and rice flour (or all-purpose flour, as in this adaptation) for extra crunch, then rolled in Japanese panko for that signature craggy, golden crust. Whether served as a game-day snack, a dinner party starter, or a side for a juicy burger, these onion rings are destined to impress.
Ingredients
- 2 large firm onions (yellow or white)
- 200 g panko breadcrumbs
- 120 g all-purpose flour
- 40 g cornstarch
- 1 teaspoon smoked paprika (3 g)
- Salt, to taste
- 180–200 ml ice-cold water
- Oil for deep-frying (vegetable or peanut)
- For the Onion Mayonnaise:
- 300 ml vegetable oil (one-third of which should be reserved onion-frying oil)
- 1 medium egg (room temperature)
- 1 tablespoon Dijon mustard
- 1 tablespoon white wine vinegar
- 1 teaspoon sugar
- 1 teaspoon salt
Step-by-Step Instructions
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Prepare the onion mayonnaise: Ensure all mayonnaise ingredients are at room temperature. Crack the egg into a narrow jar (suitable for an immersion blender). Add mustard, vinegar, sugar, salt, and 100 ml of the oil (including the reserved onion oil). Using an immersion blender, blend until smooth and emulsified. Gradually add another 100 ml of oil, blending continuously, then the final 100 ml, blending until thick and creamy. Set aside.
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Prepare the onions: Peel the onions and slice into rings about 1.5 cm thick. Separate the rings and discard the smallest inner ones (or save for another use).
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Make the batter: In a bowl, whisk together the flour, cornstarch, smoked paprika, and a pinch of salt. Gradually pour in the ice-cold water while whisking until you have a smooth batter the consistency of medium-fat sour cream.
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Fry the onion rings: Heat oil for deep-frying to 180°C (350°F) in a deep pot or air fryer. Dip each onion ring into the batter, allowing excess to drip off, then coat thoroughly in panko breadcrumbs. Carefully lower into the hot oil and fry until golden and crisp, about 1 minute. Drain on paper towels. Serve immediately with the onion mayonnaise.
Tips for Perfect Onion Rings
Keep everything cold: Ice-cold water is non-negotiable for the batter—it prevents gluten development and ensures a light, crispy coating. Similarly, chill the rings for 10 minutes after breading to help the coating adhere better. Don’t overcrowd the fryer: Fry in small batches to maintain oil temperature; too many rings at once will steam rather than crisp. Reserve that onion oil: Whenever you fry onions for any dish, pour off the excess oil and store it in a jar in the fridge. It’s liquid gold for this mayonnaise. Use a good oil sprayer if baking the rings instead (see variations).
Variations
Baked onion rings: Skip the deep-fryer and arrange the breaded rings on a wire rack set over a baking sheet. Spray generously with oil and bake at 220°C (425°F) for 12–15 minutes, flipping halfway. Spicy kick: Add ½ teaspoon cayenne pepper to the batter and a dash of hot sauce to the mayonnaise. Herb-infused mayo: Stir in a tablespoon of chopped chives or dill after blending. Gluten-free option: Replace the flour with rice flour and use gluten-free panko. Pair with a sweet, high-alcohol wine for an unexpected but delightful contrast.
FAQ
Can I use regular breadcrumbs instead of panko?
Absolutely, but panko creates a lighter, crunchier crust. If using standard breadcrumbs, reduce the amount slightly and expect a denser coating.
How do I store leftover onion mayonnaise?
Transfer the mayonnaise to an airtight container and refrigerate for up to 5 days. The flavor actually deepens over time. Use a spacious refrigerator to keep it chilled.
Can I make the mayonnaise without an immersion blender?
Yes, use a regular blender or a food processor—just drizzle the oil in very slowly while the machine runs. A planetary mixer with a whisk attachment also works if you add the oil in a thin stream.
What type of oil is best for deep-frying onion rings?
Use a neutral oil with a high smoke point, such as peanut, canola, or grapeseed oil. For an extra layer of flavor, you can mix in a small amount of the reserved onion oil. An ice maker is handy for producing the ice cubes needed to keep your water cold.
Can I prepare the onion rings ahead of time?
You can batter and bread the rings up to 2 hours in advance and refrigerate them on a baking sheet. Fry just before serving. For reheating, use a convection oven at 180°C (350°F) for 5 minutes to restore crispness.
How do I get the batter to stick better?
Pat the onion rings dry before dipping, and let the excess batter drip off well before coating with panko. Press the breadcrumbs gently to adhere. If you have a planetary mixer, you can whisk the batter briefly to incorporate air for even lighter texture.
What other dishes pair well with onion rings?
They are fantastic alongside a chocolate dessert for a sweet-savory combo, or as a side to a hearty steak. For brunch, serve them with eggs and a great cup of coffee. The onion mayonnaise also makes an excellent spread for sandwiches.
If you notice any errors or inaccuracies, please let us know.
