Tasty Tuna Melt, No Mayo Recipe - Food.com

Ingredients

• 1/3 cup minced onion
• 2 tablespoons lime juice (squeezed from one fresh lime is best)
• 1 (6 ounce) can solid white tuna packed in water, well drained
• 1 tablespoon minced fresh parsley
• 1/4 lb cheddar cheese
• 4 slices whole wheat bread
• 1 tablespoon butter (optional)
• 1 ripe tomatoes, sliced (optional)
• 1 avocado, sliced (optional)
• hot sauce (optional)