Wash the tomatoes and cut off one lid each. Hollow out the tomatoes and drain upside down. Wash and clean the zucchini and cut into small cubes. Peel and finely dice the onion.
Peel and coarsely chop the garlic. Cut the bacon into cubes. Heat 2 tablespoons of oil in a pan. Fry the bacon, onion and garlic. Add zucchini and fry. Season with salt and pepper.
Cut tomato lids into large cubes. Wash basil, shake dry and chop finely, except for a little to garnish. Fold the tomato cubes into the zucchini-bacon mixture. Stuff the tomatoes with it.
Spread cheese and sour cream on the tomatoes. Put the tomatoes in an ovenproof dish. Pour in white wine and stock. Add bay leaf, thyme and rosemary to the stock. Drizzle the remaining oil over the tomatoes and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for about 10 minutes.
Serve garnished with the remaining basil.