Mix the flour with the three eggs, the tablespoon of oil and the salt.
Use a mixer to knead it into a dough.
Cover a surface with some flour and continue with kneading the dough but now with your hands until it is smooth.
Let the dough rest for 40 minutes.
Roll half the dough with a rolling pin. If you have a pasta machine, roll the dough from wide to thin until you can almost look through it.
If you don't have a pasta machine, just keep rolling the dough until it is very thin.
Cut the dough into 4 x4 inch squares.
Put some filling in the middle of the squares.
Spinach Filling
Wash the spinach and cut it into a smaller size.
Cut the garlic and onions into small cubes.
Heat some oil in a souace large sauce pan and add the onions and garlic. Sauté for a minute.
Add the spinach, stir and cover with a lid. Let cook at medium heat for 3 minutes.
Spice with salt, pepper and nutmeg, then let the mass cool a little.
Add the egg yolk to the spinach and stir.
Use this to fill the Maultaschen.
Meat Filling
Finely cut the onion and fry with the oil it in a pan.
In a bowl mix the ground beef with the egg, egg yolk, and parsley.
Season with salt and pepper.
Add the mix to the pan with the onions and fry until cooked through.
Use as a filling for the maultaschen.
Making the Maultaschen
Stirr the egg white of an egg with a fork.
Add the filling to the middle of a dough square.
Brush some egg white along the rim of the dough.
Flip the dough to a triangle (see video).
Use a fork to press the dough together.
In a large pot bring the broth to a boil.
Optional: Add some soup vegetables.
Add some of the Maultaschen and let cook for about 15 minutes.
Serve the Maultaschen either with some of the soup or fry them in a little butter and serve them with some fried onions.
If you have cooked Maultaschen as a leftover, you can easily freeze them. Thaw them and reheat them in broth.