2. Prepare the filling:
Preheat your oven to 190°C (375°F).
In a large skillet, heat the olive oil or butter over medium-high heat.
Add the thinly sliced onions to the pan and sauté until soft and slightly caramelized, about 5-7 minutes.
Once the onions are soft, add the thinly sliced cabbage and mix well.
Cook the cabbage and onion mixture, stirring occasionally, until the cabbage is wilted and cooked to your liking, this usually takes about 10-15 minutes.
Season the cabbage and onion mixture with salt and pepper. Remove from heat and let cool slightly.
3. Assemble the cake:
Roll out the chilled dough on a lightly floured surface to line a 23 cm (9 inch) cake pan. Place the rolled out dough into the cake pan and cut off any excess dough.
Place the cooked cabbage and onion mixture evenly on the bottom of the cake. Sprinkle grated cheese on top if desired.
In a small bowl, whisk together the eggs and milk or cream. Pour this mixture into the cake over the cabbage and onion filling.
4. Bake the cake:
Place the cake in the preheated oven and bake for 30-35 minutes, or until the dough is golden brown and the filling is set.
Remove the cake from the oven and allow to cool for a few minutes before cutting into pieces and serving.
This cabbage and onion cake is hearty and flavorful and is perfect as a main dish or side dish. Bon appetit!
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