Potato and Onion Tart with Apples

For the dough: mix dry yeast with flour. Heat milk with butter. Combine milk with flour mixture and egg yolk and knead into a smooth dough with a dough attchment of a mixer. Cover and let rise in a warm place for 30 minutes.

For the filling: peel potatoes and grate coarsely. Quarter apples and core, grate coarsely. Peel onion and cut into thin rings. Combine all ingredients and season with salt, pepper and nutmeg.

Roll out dough and line buttered and floured tart pan with it, making about 3 cm (approximately 1 1/4 inch) edge all around. Spread filling on the dough and place into a cold oven. Turn oven temperature to 180°C (approximately 350°F) and bake for about 20 minutes.