- Prep
- 20 min
- Cook
- 20 min
- Total
- 40 min
- kcal
- 523.1
- protein
- 4.8 g
- Serves
- 4
Ingredients
What you’ll need — tap to tick off as you go
- 150 g
- 50 g
- 1 tsp
- 1 tsp
- ½ tsp
- 1 tsp
- ½ tsp
- 250 ml
- 1 l
Process
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Peel the onions and slice them crosswise into 1 cm thick rings. Separate the rings and set aside the small inner pieces for another use.
In a wide bowl, whisk together the all-purpose flour, cornstarch, baking powder, paprika, garlic powder, salt and black pepper until evenly combined.
Pour the ice-cold sparkling water into the dry mixture and whisk just until smooth, about 10 seconds. Small lumps are fine; do not overmix or the batter will lose its fizz.
Heat the vegetable oil in a deep heavy pot over medium-high heat until it reaches 180°C. If you do not have a thermometer, drop in a small piece of onion; it should sizzle and rise within 2 seconds.
While the oil heats, pat the onion rings dry with paper towels and toss them in a light dusting of extra all-purpose flour, shaking off the excess. This helps the batter cling.
Dip a few onion rings into the batter, letting the excess drip back into the bowl, and carefully lower them into the hot oil. Do not crowd the pot; fry in batches of 4 to 6 rings.
Fry for 2 to 3 minutes per side, turning once, until the rings are deep golden brown and crisp. Adjust the heat to keep the oil between 175°C and 185°C.
Lift the rings out with a slotted spoon or tongs and drain on a wire rack set over a baking sheet. Sprinkle with a little extra salt while hot. Repeat with the remaining rings, stirring the batter gently between batches.
Kitchen notes
Kitchen notes
- The most common mistake is a warm batter: use ice-cold sparkling water and keep the bowl over a larger bowl of ice if your kitchen is hot. A cold batter fries into a crisp shell instead of a soggy coating.
- Fry at 180°C. If the oil is too cool the rings soak up grease; if it is too hot the crust browns before the onion softens. The rings are done when they are deep golden and float steadily at the surface.
- Drain on a wire rack, never on paper towels alone. Paper traps steam underneath and softens the crust; a rack lets air circulate so the rings stay crunchy for longer.
- Do not salt the batter heavily or salt the rings before frying; salt draws out moisture and makes the coating soggy. Salt only after frying.
Substitutions
- sparkling water→cold club soda or cold plain water with 1 tsp lemon juice
- all-purpose flour→gluten-free all-purpose flour blend for a gluten-free version
- vegetable oil→sunflower or canola oil for frying
Storage & reheating
Onion rings are best eaten immediately. To store leftovers, cool them completely, place in a single layer in an airtight container lined with parchment, and refrigerate for up to 2 days. Reheat on a wire rack in a 200°C oven for 6 to 8 minutes until crisp again; the microwave will make them soggy. For longer storage, freeze the fried rings in a single layer on a tray, then transfer to a freezer bag for up to 2 months and reheat from frozen at 200°C for 10 to 12 minutes.
| Nutrient | Per serving |
|---|---|
| Calories | 523.1 kcal |
| Protein | 4.8 g |
| Carbohydrates | 47.9 g |
| Fat | 35 g |
| Saturated fat | 4.2 g |
| Fiber | 2.7 g |
| Sugar | 3.3 g |
| Sodium | 712 mg |
| Cholesterol | 0 mg |
FAQ
The questions we get asked most
Why did my onion rings turn out soggy?
Soggy rings usually come from batter that was too warm, oil that was below 175°C, or crowding the pot so the temperature dropped. Use ice-cold sparkling water, fry in small batches, and keep the oil at 180°C. Also drain on a wire rack rather than paper towels so steam can escape.
Can I make the batter ahead of time?
No, the batter loses its fizz and thickens within 15 minutes. Whisk it together just before frying. If you must prep ahead, combine the dry ingredients in one bowl and keep the sparkling water in the fridge, then mix them at the last minute.
How do I know when the onion rings are done?
They are ready when they are deep golden brown all over and float steadily at the surface of the oil, about 2 to 3 minutes per side. The coating should look dry and crisp, not pale or shiny. If they brown in under a minute, the oil is too hot.
Can I use a different type of onion?
Yes. Yellow or white onions are classic because they hold their shape and turn sweet. Red onions work but bleed color into the batter. Sweet Vidalia onions are excellent but soften faster, so slice them a little thicker, about 1.5 cm.
Can I bake onion rings instead of frying?
You can, but the result is more like a crunchy onion than a classic ring. Dip the rings in batter, place on an oiled rack over a baking sheet, drizzle with a little oil, and bake at 220°C for 12 to 15 minutes, flipping once. They will not be as crisp as fried.
Why does the batter slide off the onion rings?
The onions were probably wet or not dusted with flour. Pat the rings completely dry and toss them in a light coating of flour before dipping. Also let excess batter drip off before frying, and do not stir the rings in the oil for the first 30 seconds.
Can I reuse the frying oil?
Yes, if it is not too dark or smoky. Cool the oil completely, strain it through a fine sieve or coffee filter into a clean jar, and store it in a cool dark place for up to 2 weeks. Discard it if it smells stale or foams heavily when reheated.
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