Add beef and seasonings to a non-stick skillet. Cook over medium high heat until no longer pink, stirring to crumble. Allow to cool before packing in a lunch. (It is best if prepared the night before.)
Shred cheese, slice tomatoes in half, and cut cucumber into slices or sticks.
Serve at home or pack into lunchboxes, keeping each ingredient separate to allow children to assemble lunch on their own.