Fry in a big frying pan with some oil 4 chopped onions with 1 finely chopped garlic clove until the onions are soft. Add 250ml tomato passata, 125g cherrytomatoes (halved) and some thyme. Heat it shortly. Add 1 1/2 liter vegetable stock and bring it all to boil. Lower the heat and cover the lid. Let it simmer for about 30 minutes. Scatter some grated cheese over the soup. Enjoy!