Preparing the filling.
Fry the leek cut into half rings in olive oil for a couple of minutes (if you haven’t found the leek, take the onion, but fry it until transparent).
Add chopped white and red cabbage to the onion. Fry for a couple of minutes over medium heat. Boil the Brussels sprouts and broccoli in boiling water for a couple of minutes, discard in a colander and add to the rest of the vegetables. Add salt, add your favorite seasonings (I added a mixture of stewed vegetables and dried basil) and simmer for another 3-4 minutes.