Brown the meat in a large pan, adding cumin, oregano, salt and pepper.
Warm the tortillas in a dry pan for a few seconds so they are soft and pliable.
Layer the beans, rice, meat, cheese, tomato and lettuce one after another in the center of each tortilla - leaving a free edge of at least 4-5 cm all around.
Roll the bottom edge up over the filling, fold in one side and tuck it under the filling, then fold the other side in at an angle (this holds the roll together), and finally fold over the remaining edge.