Clean and wash the zucchini and cut them in half lengthwise. Cut the ends diagonally and cut into small cubes. Hollow out the zucchini halves with a teaspoon and place them in an ovenproof dish. Pour on the stock and cook in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 15 minutes. In the meantime, peel and finely chop the onion and garlic. Fry onion, garlic, courgette cubes and soup vegetables in hot oil.
Add the minced meat and fry. Pluck the marjoram leaves from the stalks and chop coarsely. Stir into the sour cream. Season with salt and pepper. Fill the pre-cooked zucchini halves with the chopped mixture, spread the marjoram sour cream on top and bake for another 10 minutes