Open and drain your tuna cans. Chop your green onion, bell pepper, and cilantro. Slice the tomatoes, and cut out a wedge of lemon.
In a bowl, combine your tuna, mayo, mustard, nature's seasoning and black pepper.
Add your bell pepper. and stir together.
Squeeze in your lemon juice.
Rinse your lettuce and pull out the large pieces. About 8 of them for 4 people. spoon in about 1/2 cup of the tuna salad into the lettuce. Wrap and enjoy!