Mix the flour, salt, eggs and beer into a smooth batter. Peel the onion and cut into rings approx. 1 cm thick. Now pull the onion rings through the dough, then place them in hot fat (approx. 180 ° C) and fry for 2 minutes.
The onion rings are suitable as a starter or side dish. A garlic sauce or tomato ketchup goes very well with it for dipping.