Two Tomato Gratin Recipe

Ingredients

• 2 large green tomatoes, thinly sliced
• 2 large firm red tomatoes, thinly sliced (I like heirlooms for this)
• 1 small red onion, thinly sliced
• 4 large garlic cloves, sliced
• 6 slices whole wheat bread (very thinly sliced)
• 1/2 cup mozzarella cheese, shredded
• 1/2 pound thinly sliced provolone cheese
• 1/4 cup shaved parmesan cheese
• 1/2 cup fresh lemon basil leaves
• salt
• pepper
• 2 tablespoons balsamic vinegar
• 3 tablespoons olive oil