Rollup Tuna Tacos

1. Drain tuna and place in a mixing bowl.
   
2. Mix in salsa and mayonnaise.
   
3. Meanwhile, slice onion and tomato, separate lettuce leaves.
   
4. For each serving, spoon half the tuna mixture down the center of one tortilla. Repeat with second tortilla.
   
5. Dice tomato and slice onion. Sprinkle tomato and onion on top of tuna mixture in tortillas.
   
6. Top with shredded cheese and lettuce. Rollup and enjoy with tortilla chips.