Alsatian onion tart

Ingredients:

Shortcrust pastry: 250 g plain flour, 125 g butter, 5 g salt, 8 cl water, 1 egg yolk

Topping: 400 g onion, 1 tbsp oil, 4 eggs, 1 tbsp flour, 1/4 l milk, ¼ l crème fraîche, salt, pepper, nutmeg

Preparation:

Knead all the ingredients into a dough. Leave to rest for approx. 2 hours.
Peel the onions and cut into rings. Fry in butter and oil for approx. 20 minutes until golden brown. Dust with flour and roast briefly. Set aside.
Whisk together the milk, crème fraîche, eggs, salt, pepper and nutmeg.
Roll out the dough and place in a buttered ovenproof dish. Prick the base several times with a fork. Spread the roasted onion evenly over the top and pour over the royal. Bake in a preheated oven at 180° C for about 30 minutes.