No Mess Squash on the Barbeque

INGREDIENTS

• 2 yellow squash, cut into 1/2-inch slices
• 2 zucchini, cut into 1/2-inch slices
• 2 tomatoes, cut into wedges (optional)
• 1 small onion, sliced and separated into rings
• 2 cloves garlic, minced
• 2 tablespoons olive oil
• salt and pepper to taste
• 2 tablespoons chopped fresh parsley (optional)