Shredded Beef Fajitas

Name: Shredded Beef Fajitas
Cook time: 10 h
Total time: 10 h
Cuisine: Mexican, Latin American, American, TexMex
Ingredients: 1 (1 1/2lb) boneless beef flank steak, cut in 6 pieces; 1 can (14oz) diced tomatoes with mild green chiles; 1 cup chopped onion; 1 green bell pepper, chopped; 2 cloves garlic, minced; 1 package (1 1/2oz) fajita seasoning mix; 12 (8in) flour tortillas