Roughly dice the zucchini, bell peppers and onions and leave the mushrooms whole if they are not too big. Put the vegetables on eight kebab skewers.
Prepare a marinade from the juice of a lemon, the pressed garlic cloves and the olive oil and pour it over the skewers. Let it steep in the marinade for about 30 minutes before grilling. Then put on the grill.
The specified quantities are calculated as a supplement.