Instead of buying packaged convenience food containers, make your own! Pack the different parts of this “sandwich” for lunch at school. It’s a little messy because you don’t need any utensils - but that’s why kids would love making this recipe.
Drain can of tuna, reserving one teaspoon of the oil.
In a small bowl, stir together tuna, reserved oil, lettuce and mustard.
Divide tuna mixture among 5 of the crackers and top with remaining crackers.