Crispy Onion Rings That Actually Stay Crispy (Demon Rings at Home)

Onion rings are £4.50 for seven on our menu, and Demon Rings are the same ring tossed in our fiery Demon sauce. They are also the thing people are most disappointed by when they try to make them at home, because most recipes give you a soggy batter that slides off in one piece and leaves you holding a bare onion.

This version fixes that with three specific things: a thin flour dusting before the batter, ice-cold sparkling water in the batter itself, and a panko coat on the outside. The dusting gives the batter something to grip, the cold fizzy water keeps the batter light and stops it absorbing oil, and the panko gives you the rattle.

Twenty minutes of prep, ten minutes of frying, and you can finish them plain with salt or toss them in Demon sauce. Makes enough for four as a side.

Why this recipe works

• The rings are dusted in seasoned flour first. Batter will not stick to a wet, slippery onion. A thin dry layer changes that completely and it is the single most common thing home cooks miss.
• Ice-cold sparkling water in the batter. The bubbles create steam pockets as they hit the oil, which puffs the batter, and the cold slows gluten development so the coating stays tender rather than tough.
• Cornflour alongside the plain flour. Cornflour has no gluten, so it fries drier and crisper. A third of the flour weight is about right.
• Panko on the outside. Optional in theory, essential in practice. It gives you the audible crunch and it stops the batter looking pale and doughy.
• Only the outer rings are used. The small inner rings from the middle of the onion cook faster and burn. Save them for something else.
• Salted the second they come out. Salt only sticks to hot, slightly oily surfaces. Thirty seconds later it just falls off.

Ingredient notes

Onions. Large brown or Spanish onions. You want them big enough that the rings are a decent size — about 1.5cm thick. Spanish onions are milder and sweeter, brown onions are more assertive. Red onions look good but go slightly grey once cooked.

Sparkling water. Any cheap sparkling water, straight from the fridge. Lager works too and gives a slightly maltier flavour. Flat water will still make onion rings, just heavier ones.

Plain flour and cornflour. Two parts plain to one part cornflour for the batter, plus a separate seasoned plain flour for the dusting. Do not use self-raising flour; the raising agents make the batter puff too much and split.

Panko breadcrumbs. Japanese-style, large and flaky. Standard golden breadcrumbs give a denser, sandier coating and are not the same thing.

Smoked paprika and garlic powder. In the dusting flour. They season the onion itself rather than just the outside, which is what stops the middle tasting bland.

Sunflower oil. Or vegetable or rapeseed. Neutral, cheap, high smoke point. You need enough depth for the rings to float freely, which is about 6cm in a deep pan.

Substitutions and variations

Demon Rings. Toss the hot rings in the Demon sauce from our Demon and Angel wings recipe. Do it in a warm bowl, quickly, and serve immediately — sauced rings soften fast.

Angel Rings. The zesty non-spicy sauce from the same recipe, which is genuinely lovely on onion and nobody expects it.

Air fryer. Dust, batter, panko as normal, then spray very generously with oil and air fry at 200°C for 10 to 12 minutes, turning halfway. Noticeably less crisp than fried, but a reasonable weeknight option.

Beer batter. Swap the sparkling water for very cold lager. Skip the panko for a more traditional pub-style ring.

Gluten free. A gluten-free flour blend plus cornflour works for the batter, and gluten-free panko is available. We have not tested this version, so treat the timings as a starting point and check every label yourself.

The Ring Leader. Pile the rings on top of macaroni cheese with sautéed potatoes. That is a dish on our menu and it is exactly as good as it sounds.

Step-by-step guidance

The full method is in the recipe card below. Four things separate good rings from disappointing ones.

Cutting and separating. Slice the onions across into 1.5cm rounds, then push the rings apart with your fingers. Keep the outer two or three rings from each slice and set the small inner ones aside. Thinner than 1cm and the onion disappears; thicker than 2cm and it stays raw in the middle.

The dusting. Toss the rings in the seasoned plain flour and shake off the excess properly. You want a thin, even, dry film — not clumps. Do this before you make the batter so the flour has a minute to sit.

The batter. Whisk the dry ingredients first, then add the ice-cold sparkling water and mix only until it just comes together. A few small lumps are fine and actually desirable. Over-mixing develops gluten and gives you a chewy coating. It should be the consistency of single cream — thin enough to see the ring through it.

Frying. Oil at 180°C. Dip a floured ring into the batter, lift it out and let the excess run off for a second, then press it into the panko on both sides. Lower it into the oil away from you. Fry four or five at a time for two and a half to three minutes, turning once, until deep golden. Any more in the pan and the oil temperature drops and the batter goes greasy. Drain on a wire rack, salt immediately.

Professional tips

• Set up a proper line before you start: flour, batter, panko, then the pan. Wet hand and dry hand, and do not swap.
• Keep the batter bowl sitting in a larger bowl of iced water. It stays cold and the rings stay light.
• Fry in small batches and let the oil come back up to 180°C between them. A thermometer removes all the guesswork.
• Never drain onto kitchen paper on a plate. It traps steam and softens the underside. A wire rack, every time.
• Serve within five minutes. Onion rings have a very short window and no amount of technique changes that.
• If you are tossing them in sauce, warm the bowl first and use the minimum sauce that coats.

Troubleshooting

Problem	Likely cause	Solution	Prevention
Batter slid off in the oil	Rings were not dusted in flour first	Dust the remaining rings and carry on	Always dust in seasoned flour and shake off the excess
Onion pulled out and left an empty shell	Rings too thick, or overcooked	Nothing to do, but slice thinner next time	1.5cm rings, and do not fry beyond three minutes
Coating is pale and doughy	Oil too cool, or batter too thick	Return to 180°C oil for 45 seconds	Thin the batter to single cream consistency and hold the oil at 180°C
Rings are greasy	Too many in the pan at once	Drain on a rack and salt	Four or five at a time, and let the oil recover
Coating is chewy rather than crisp	Batter over-mixed, or water not cold	Make a fresh batch of batter	Mix until only just combined, and use ice-cold sparkling water
Onion tastes raw	Rings too thick	Finish in a 190°C oven for four minutes	Stick to 1.5cm and use the outer rings only

What to serve with it

Onion rings want a dip. Garlic mayonnaise, burger sauce, sriracha mayonnaise or plain ketchup all work. Our Demon sauce is the house answer.

As part of a sharing spread they sit beside Demon and Angel wings and crispy naga chilli sliced potatoes — put all three together and you have most of The Starter Squad XL. Piled onto macaroni cheese they become The Ring Leader. More in our bao and starters recipes.

Storage and reheating

Onion rings are a fry-and-eat food. Nothing you do will make a reheated one as good as a fresh one.

If you do have leftovers, cool them quickly, refrigerate within two hours and eat within 24 hours, in line with standard UK food safety guidance. Reheat in an oven or air fryer at 200°C for five to six minutes. Do not microwave them.

Freezing works better than refrigerating. Fry the rings, cool them completely, open-freeze on a lined tray and bag them. Reheat from frozen at 200°C for eight to ten minutes. They come back surprisingly well, which makes a big batch worth doing.

The batter cannot be made in advance in any useful way — the whole point is that it is cold and freshly mixed.

Frequently asked questions

Why do my onion rings always go soggy?

Almost always one of three things: the oil was not hot enough, too many went in at once, or they were drained on kitchen paper on a plate. Fix those and the problem disappears.

Can I prepare the rings ahead?

You can slice, separate and dust the rings up to an hour ahead and keep them on a tray. The batter and the frying have to happen at the last minute.

Do I need a thermometer?

It makes it much easier. If you do not have one, drop a small piece of bread in — it should turn golden in about 40 seconds at 180°C.

What is the best onion to use?

Large Spanish onions, because they are sweet and the rings are big. Brown onions are sharper and also good. Avoid small onions entirely — the rings are too fiddly to be worth it.

Can I use the small inner rings?

Not for this. They cook too fast and burn. Chop them and use them in a gravy, a curry or the onion gravy from our sausage and cheesy mash recipe.

How many rings does one onion make?

Two large onions give you around 14 to 16 usable outer rings, which is enough for four people as a side.

What do I do with the used oil?

Cool it completely, strain it back into a bottle and reuse it once or twice more. Take it to a household recycling centre when you are finished with it, and never pour it down the sink.

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Or let us do the frying

A pan of hot oil for seven onion rings is a lot of washing up. Onion rings are £4.50 on our menu at 172 Biscot Road in Luton, and Demon Rings come with the fiery sauce already on them. Order for collection or delivery, or look at The Starter Squad XL if you are feeding a few people.

If you make them at home, rate the recipe below and tell us whether you went plain or Demon.

Newer From Our Kitchen

Onion rings and crispy sliced potatoes together make a genuinely excellent plate. They are also the right side for our paratha burger, which swaps the bun for a flaky layered paratha.