(The mushroom sandwiches can be assembled several hours ... the mozzarella should start to melt. Place the grilled mushroom caps on individual plates, drizzle with pesto, and serve.
Grilled veg pesto sandwich can be prepared at home without any hassle ... Heat oil in a pan add the garlic, onion, bell peppers and toss it well. Now add the mushrooms and zucchini and toss is again.