Cucumber (julienned), or even better green papaya or green mango
Mango (not too riped), diced
An avocado, diced
Green onions, chopped
2 tbsp of Fish sauce
3 tbsp of Fresh Lime juice
Pinch of sugar
How to
cook
Mix the tuna, the red onion, the mango, the avocado, the cherry tomatoes, the cucumber, and the green onions in a serving dish.
For the sauce, mix the fish sauce, fresh lime juice and the sugar. You can then adjust if you prefer your sauce more (more lime juice) or less acid (more sugar).