In a medium bowl combine all ingredients except the lettuce.
Add a couple lettuce leaves (or chop it for easier eating, if desired) on six individual plates (or one large platter for serving family-style as a dinner). Spoon tuna salad on top.
Alternately, for a brown bag lunch, pack the tuna into one container and the lettuce into another and spoon tuna on top of lettuce at lunch time.
Notes
Serving Idea: Serve with pita chips or warmed pita halves.Recipe adapted from Cooking Light.