Slice the round beef thinly.
Shred the cabbage.
Heat olive oil in a pan and stir-fry the round beef.
Season the beef with salt and pepper.
Add cabbage and stir-fry together.
Warm the tortilla.
Place the stir-fried beef and cabbage on the tortilla.
Add sauce or cheese as desired.
Roll up the tortilla and place it on a plate.