Boil the potatoes, zucchini and garlic. Mash them and season with the salt and dill.
Pour this into a pastry bag or plastic baggie with its corner cut off and spray out bombs of the desired shape.
Grate the cheese and sprinkle it well on top. Bake in an oven preheated to the maximum setting until reddened.
Wait for them to cool slightly before taking them out.