Cut the potatoes and zucchini into small cubes. Cut the tomatoes into sixths and put everything in a baking dish.
Mix the cream with the lemon juice. Add the garlic, salt, pepper and sugar and pour everything over the vegetables. Pour the finely chopped basil over it and sprinkle with the cheese.
Bake in an oven preheated to 180 ° C for about 40 minutes.