Defrost spinach at room temperature. Mix flour and 1 teaspoon salt in a bowl. Add 1 egg, 125 g butter and 1-2 tbsp. cold water and knead first with the dough hooks of the hand mixer, then with your hands to a smooth shortcrust pastry. Wrap the dough in foil and refrigerate for about 30 minutes. Peel and finely dice the onion.
Wash and clean the tomatoes. Roll out the short pastry to a circle (approx. 32 cm Ø) on a floured work surface. Line a greased tart tin with lift-off base (approx. 28 cm Ø) and press the edge lightly. Cut off any excess dough. Prick the base of the dough several times with a fork. Squeeze the thawed spinach. Heat 1 tablespoon butter in a pot. Briefly sauté diced onions in it, then add leaf spinach. Steam spinach for about 3 minutes and season with salt, pepper and nutmeg. Cut gorgonzola into small pieces. Spread the spinach, tomatoes and gorgonzola pieces on the dough. Whisk cream, sour cream and 4 eggs and season with salt, pepper and nutmeg.
Briefly sauté diced onions in it, then add leaf spinach. Steam spinach for about 3 minutes and season with salt, pepper and nutmeg. Cut gorgonzola into small pieces. Spread the spinach, tomatoes and gorgonzola pieces on the dough. Whisk cream, sour cream and 4 eggs and season with salt, pepper and nutmeg. Pour cream mixture over the vegetables. Sprinkle with pine nuts. Bake the quiche in a preheated oven, lower shelf (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 40 minutes
Waiting time approx. 45 minutes