~ my own little brain
1 T. lime juice
22 oz. canned tuna
1 cucumber, chopped
salt and pepper, to taste (optional)
20 grape tomatoes, halved
8 lettuce leaves
Pit and peel the avocados, then mash with lime juice. Stir in tuna, cucumber, salt, and pepper. Scoop tuna mixture onto lettuce leaves. Garnish with tomatoes.
Notes: The amount of each ingredient is just a starting point, so adjust according to taste.