Onion Rings Recipe

Peel the onions and slice into 1/4- to 3/8-inch (6–9 mm) thick rings. Separate rings gently into individual circles, discarding the small center cores if they break apart. Pat the rings dry with paper towels to remove excess moisture.

If you want more uniform rings, cut off the top and root ends first and trim any ragged edges before slicing.

Prepare dry mix

In a medium bowl, whisk together 1 cup all-purpose flour, 1/4 cup cornstarch, 1 teaspoon baking powder, 1 teaspoon fine salt, 1/2 teaspoon black pepper, and 1/2 teaspoon paprika until evenly combined.

Combine wet and dry

In a separate small bowl, beat 1 large egg lightly. Pour the egg and 1 cup cold sparkling water into the dry mix and whisk until just combined; a few small lumps are fine. The batter should be fairly thick but pourable—adjust with another tablespoon of cold water if too thick. Keep batter cold by placing the bowl over an ice bath or in the refrigerator while you heat the oil.

In a shallow dish, mix 1/2 cup flour with 1/4 teaspoon salt. This light dredge helps the batter adhere to the onion rings.

Lightly toss a few onion rings at a time in the dredge, shaking off excess flour before dipping into the batter.

If using panko for an extra-crispy coating: place 1 cup panko mixed with 1/2 cup seasoned breadcrumbs in a shallow bowl. After dipping a dredged onion ring into batter, immediately press it into the panko to coat both sides, or drop the battered ring straight into the oil and scatter a tablespoon of panko into the oil around it for partial adherence. Note: this adds a thicker, crunchier crust and shortens batter-only crisp time.

Pour about 3–4 cups of oil into a heavy-bottomed pot or Dutch oven so there is at least 2–3 inches of oil depth. Heat the oil over medium-high heat to 350°F (175°C). If you don't have a thermometer, test by dropping a small bit of batter into the oil: it should sizzle and float to the surface within a few seconds and begin to brown.

Working in small batches (to avoid crowding and oil temperature drop), dredge each ring in flour, dip into the cold batter letting excess drip off, optionally coat with panko, and gently lower into the hot oil using a slotted spoon or tongs. Fry 2–4 minutes, turning occasionally, until golden brown and crisp. Thinner rings will cook faster; thicker rings may take up to 4 minutes.

Use a slotted spoon to transfer cooked rings to a wire rack set over a baking sheet or to paper towels to drain. Sprinkle lightly with 1/2 teaspoon fine salt while still hot. Keep finished rings warm in a 200°F (95°C) oven on a wire rack while you cook remaining batches.

Serve onion rings immediately for best texture. Offer dipping sauces such as ketchup, ranch, spicy mayo, or barbecue sauce alongside.

If you must reheat, use a 375°F (190°C) oven for 5–8 minutes on a wire rack to restore crispness rather than a microwave.