Roast Beef without guinness whites

1 tablespoon vegetable oil 1 onion, chopped 1 clove garlic, minced 4 tomatoes, chopped 2 cups chopped cooked roast beef 1 (8 ounce) jar prepared taco sauce 1[...]

2 teaspoons olive oil 1/2 cup onions diced 3 cloves garlic minced 12 ounces beef roast sliced into strips 14 ounces tomatoes, canned diced 4 ounces green[...]