By applying the following professional tricks, homemade onion rings can be nearly identical to those from restaurants—perfectly crispy, golden on the outside, juicy and tender on the inside, ready to be served with your favorite sauces and burgers.
Choose large, bright onion bulbs. Sliced to about 1 cm thick, the onion should be gently separated into rings. To keep the interior juicy, it is recommended to soak the rings in cold water or milk for 30 minutes before breading.
After soaking in water or milk, thoroughly dry the rings with a paper towel. Excess moisture reduces crispiness and can cause oil splattering.
The basic ingredients for the batter are flour, eggs, and liquid (milk or mineral water for extra crispiness). For an authentic restaurant-like effect, cornmeal can also be added to the batter, helping the rings become golden and airy.
Dip the onion rings first in flour, then in the egg and liquid mixture, and again in flour or breadcrumbs. This double layer creates the recognizable crispy crust. Frying is done in hot oil (around 175°C) until they turn golden.
Professional restaurants often fry onions twice: first at a lower temperature to cook them through, and second at a higher temperature to achieve a golden-brown crispy crust. This method ensures perfect texture without losing juiciness.
The optimal frying temperature is between 175 and 180°C. Oil that is too cold makes them greasy, while oil that is too hot can quickly burn them on the outside while leaving them raw inside.
After frying, remove the onion rings onto a paper towel to drain excess grease. Salt them immediately while still hot so that the seasoning adheres better.