Tuna on Whole Grain Toast: 5 Best Healthy Lunch Ideas

Ingredients

• 1 (5 oz) can of tuna in water, drained
• 2 tablespoons mayonnaise (Greek yogurt can be used as a lighter alternative)
• 1 tablespoon Dijon mustard
• 1 tablespoon lemon juice (freshly squeezed)
• 1 stalk celery, finely chopped
• 1 small red onion, finely chopped
• Salt and pepper, to taste
• 1 tablespoon fresh parsley, chopped (optional)
• 4 slices whole grain bread
• 1 tablespoon olive oil or butter, for toasting
• Optional toppings: sliced avocado, sliced tomato, or lettuce leaves