This tuna salad gets its bright flavor from two good-for-you ingredients: Greek yogurt and shredded apple.
Whisk together mayonnaise, yogurt, and lemon zest and juice; season with salt and pepper. Stir in tuna, celery, and apple. Serve with bread, onion, cucumber, and sprouts.
To store, refrigerate tuna salad in an airtight container, up to 1 day.