Mix milk, 1⁄8 l oil, 1 egg, 1 ½ teaspoon salt and 100 ml water. Add 500 g flour and knead everything into a smooth dough. Shape dough into a ball and rub with 2 tbsp. oil. Wrap in foil and let rest for about 45 minutes.
Boil 400 ml of salted water. Cover the rice and let it swell for about 20 minutes. Let cool down.
Clean and wash the spinach. Peel and finely dice onions and garlic. Fry in 2 tablespoons of hot oil in a large pot. Add the spinach and cover and let it collapse. Season with salt and pepper.
Then drain or press out very well.
Grate the parmesan, mix with 4 eggs. Season with salt, pepper and nutmeg. Mix in rice and spinach.
Roll out the dough on a damp tea towel in a thin oval (approx. 45 x 50 cm). Carefully place the dough in a greased springform pan (26 cm Ø) with flour (the dough overlaps the edge widely).
Fill in the spinach mixture. Fold over the excess dough towards the middle and press down well. Bake the cake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 50 minutes. Whisk the egg yolks and 2 tbsp. water.
Spread the dough with it after 30 minutes. Let the finished cake rest on a cake rack for about 10 minutes, then remove from the mould. Serve with yoghurt.