If using bamboo skewers, soak in cold water about 15 minutes before cooking.
In a bowl, combine honey with soy sauce and garlic. Add the tofu, peppers, and zucchini. Stir to coat.
Cover and marinate for 15 minutes in the fridge, ideally for 8 hours.
At the time of cooking, preheat the barbecue to medium-high power.
Drain tofu, peppers, and zucchini. Reserve the marinade.
Alternatingly pierce cubes of tofu, peppers, and zucchini on skewers.
Place the skewers on the hot and oiled barbecue grill. Close the lid and cook for 10 minutes, turning occasionally and brushing with a little marinade.