Zucchini and Tomatoes Toss 2 sliced zucchini, 2 diced tomatoes, 4 smashed garlic cloves, olive oil, basil, and salt and pepper on a sheet of foil. Form a packet. Grill over high heat, 10 minutes. Top with grated parmesan. Toss 4 portobello caps, 4 smashed garlic cloves, 1/4 cup olive oil, 1 teaspoon red pepper flakes, salt and chopped parsley to taste. Divide among 4 foil packets. Grill over medium heat, turning once, 10 minutes.