Broiled Tomatoes Stuffed with Tuna

Ingredients

• 1 (6.4 oz.) Pouch or 2 (2.6 oz.) Pouches or 2 (5 oz.) Cans - Chunk Light Tuna in Water
• 6 ripe beefsteak tomatoes
• 1 – 2 Tbsp. butter or margarine
• 1 tsp. fresh minced garlic
• 1⁄2 medium onion, chopped
• 5 oz. crimini mushrooms, cleaned and trimmed, chopped finely
• 3 cups French or sourdough breadcrumbs, fresh, coarsely chopped
• 1 cup shredded part skim mozzarella cheese
• 1 – 2 Tbsp. olive oil