Divide the cauliflower into florets and cut the stalk into approx. 1 cm thick slices. Bring to the boil in lightly salted water and blanch for approx. 4 minutes. Drain and drain well.
Peel the onions, cut one onion in half and cut 3 thin slices. Dice the rest of the onions. Finely chop the garlic.
Sauté the onions in a pan with a little oil, sauté the garlic briefly.
Meanwhile, beat the eggs with salt, pepper and nutmeg. Mix the flour and baking powder and mix with the eggs to form a smooth batter. Stir in the parmesan, chopped parsley and diced onion and fold in the cauliflower.
Pour the mixture into a well-closing springform pan lined with baking paper and cover with onion rings.
Bake in the oven preheated to 190 ° C top / bottom heat for about 30 minutes on the middle rack, until the dough is thick.
Serve warm as a small dish for 2 people, with a salad goes well.