FIRST STEP:
Brown and drain the ground beef. Stir in ketchup, Worcestershire, minced onion, salt, and pepper.

SECOND STEP:
Grill or warm tortillas. Add cheese down the center and spoon on beef.

THIRD STEP:
Top with mustard and tomato slices. Roll up tightly burrito-style.

FOURTH STEP:
Grill wraps in a hot skillet, turning every minute until golden on all sides.

FIFTH STEP:
Remove from grill, gently unroll, add shredded lettuce, roll back up, and enjoy hot!