How to Make German Onion and Potato Tart

This crustless onion and potato tart is of German origin. It's a lovely meal for colder days when served with steamed vegetables or meat, or it can be served cold for a picnic or cold luncheon on warmer days.

Ingredients

4 large potatoes
Boiling water
Salt
1 onion
A little milk
2 eggs
2 tablespoons of all-purpose/plain flour
A little thyme
1 teaspoon olive oil
Grated cheese, enough to cover the top layer of the tart when assembled

Part 1

Part 1 of 4:
Preparing the potatoes

1
Clean and peel the potatoes.
2
Put the peeled potatoes whole in boiling water. Add a little salt.
3
Parboil the potatoes. Do not overcook so that they fall apart. Cook just enough to soften them a little.
4
Remove from the heat. Drain and stand aside to cool.

Part 2

Part 2 of 4:
Preparing the onion

1
Cut the onion in half. Slice it into slices of 1 centimeter (0.4 in) thickness. The slices should be solid and not too thin.
2
Put the onion slices in a frying pan with some butter. Heat gently and cook until they start glaze. The onions should not be fully cooked, so do not leave them to cook until they turn brown, just cook enough until soft and transparent.

Part 3

Part 3 of 4:
Making the filling for the tart

1
When the onion has softened, add a little milk. Keep heating but do not let it boil.
2
Remove the pan from the heat.
3
Beat 2 eggs. Add the beaten eggs to the pan of fried onion slices. Stir to thoroughly mix the ingredients.
4
Add the flour. Mix well, so as to not form lumps.
5
Preheat the oven.
6
Cut the parboiled potatoes into slices. Layer the potato slices in a baking dish. Add salt to taste, thyme and a teaspoon of olive oil.
7
Pour the onion mixture over the potato slices.

Part 4

Part 4 of 4:
Baking the tart

1
Put the dish in the oven. Bake on a medium heat for 15 to 20 minutes.
- Check from time to time to see if the top layer is setting.
2
When the tart is done, sprinkle grated cheese over the onion and potato slices. Return to the oven for 5 minutes, cooking until the cheese melts.
3
Remove from the oven. Cut into slices and plate up. Serve immediately if eating hot.