Looking for lunch box ideas, or ideas for after-school snacks? If you think tuna is a tired choice, perk it up with this recipe. No mayo means no soggy mess when lunchtime rolls around—olive oil makes a tasty and nutritious substitute. Tuna fish is a fabulous source of protein and omeg-3 fatty acids, so you already know that it's healthy; now, you just need to make it yummy! This easy recipe does the trick.