Grilled Steak

Ingredients 1. 1 pound skirt or flank steak, trimmed of excess fat 2. Salt and pepper to taste 3. 1 cup fresh chimichurri sauce, homemade or store bought 4. 4 large flour tortillas 5. 2 cups shredded cheese (monterey jack or cheddar blend) 6. 1 tablespoon olive oil 7. Optional