INGREDIENTS
1
large onion, sliced into rings
1
(3- to 4-pound) sirloin beef roast
1/2 cup
water
2 1.25 ounce packages
taco seasoning mix, divided
16
(6-inch) flour tortillas
4 cups
shredded Cheddar or Monterey Jack cheese
Toppings: diced tomatoes, diced onions, sliced jalapeño peppers, sour cream, black beans
Pico de Gallo