Beef Taco Mac

1 lb beef cubed steaks
1 T vegetable oil
1 medium onion, chopped
1 pkg. (1 1/4 oz) taco seasoning mix
2 cans (14-1/2 to 16 oz each) tomatoes, diced, undrained
1-1/2 C uncooked rotini (spiral) pasta
1/2 C shredded cheddar cheese

Cut Beef steaks lengthwise into 1"-wide strips and then crosswise into 1" pieces.

Heat oil in Dutch oven over medium-high heat until hot. Add Beef and onion; cook and stir 3 minutes.

Season with 1/4 teaspoon salt.

Stir in taco seasoning, tomatoes, pasta and 1/2 cup water; bring to a boil.

Reduce heat to low, cover tightly and simmer 20 minutes or until pasta is tender.