Hawaiian Tuna Sandwich

Ingredients (10)

• + 4 hamburger buns, split add to pantry
• + 2 tablespoons butter add to pantry
• + 1 (5 ounce) can tuna chunks in olive oil add to pantry
• + 1 tablespoon lemon juice add to pantry
• ✓ salt and freshly ground black pepper to taste
• + salt and freshly ground black pepper to taste add to pantry
• + 1 dash chili powder add to pantry
• + 1 cup shredded lettuce add to pantry
• + 1 cup shredded mozzarella cheese add to pantry
• + 4 canned pineapple rings add to pantry