In a nonstick skillet over medium-high heat, warm the Guerrero Caseras tortillas one at a time. Set aside.
Spread warm refried beans on each tortilla and fill them with rice, divided evenly on all six. Then, add the grilled beef steak on each one with a sprinkle of Monterrey Jack cheese.
Fold in 1 ½ inches of the tortilla on each side and roll into a tight burrito. Warm the burritos in the oven at 200 degrees for 8-10 minutes until the cheese melts. Serve immediately with a side of guacamole.