1 large onion, sliced into rings
1 (3 to 4-lb.) sirloin beef roast
1/2 cup water
2 envelopes taco seasoning mix, divided
16 (6-inch) flour tortillas
Toppings: diced tomatoes, diced onions, sliced peppers, sour cream, black beans, black olives, slices of avocado, shredded lettuce, etc.
4 cups (16 oz.) shredded cheese
Taco sauce or salsa
Place onion in a 5-quart slow cooker; add roast and 1/2 cup water. Sprinkle 1 pkg. taco seasoning mix over top of roast. Cover and cook on HIGH 5 hours. Remove roast and shred with 2 forks; return to slow cooker and stir in remaining pkg. of taco seasoning mix. Cover and cook on HIGH 30 more minutes or until boiling.
Heat tortillas according to pkg. directions. Using a slotted spoon, spoon beef mixture evenly down center of each tortilla; top with desired toppings, cheese and sauce. Fold up to eat.
Serves 8 to 10; Source: Southern Living 2004 Annual Recipes.