Cut the vegetable onions into rings ½ cm thick. Mix the flour and beer into a smooth batter and season with salt and pepper.
Heat the oil in a saucepan to approx. 180 degrees, add a test drop of dough if necessary, when the oil bubbles and the droplet slowly turns golden yellow, the temperature is right.
Dip the onion rings in the batter and deep-fry in the hot fat until golden. Drain on kitchen paper.