New favorite recipe: Simple Steak Fajitas

I found this recipe because I had some leftover roast that did not turn out very tender that I waned to make delicious.  The original recipe is found at Walking on Sunshine.  I liked it because it was simple and seemed easy to change to my family's tastes.  If you don't have beef already cooked, her instructions will be helpful. Here is my version of steak fajitas:

Ingredients:
Cooked steak or roast in a bit of its own broth (if you have any left)
Sweet Bell Peppers
Sweet onions
taco seasoning
oil
worcestershire sauce
Other yummy seasonings (I have a delicious mango chili grinder and a garlic salt grinder that I added to kick it up a notch!)
shredded cheddar cheese
tortillas or rice
favorite toppings such as sour cream or guacamole or salsa

Directions:  You can cook all this together in one pan, but I had meat that needed to be more tender so I threw the meat in the crockpot with all the seasonings and let it cook for the afternoon.  Perfection!  I sauteed the thinly-sliced onions and peppers in the seasonings and oil right before serving because I did not want them to get over-cooked and soggy in the crockpot.  But honestly, it probably would have been fine to throw it all in the crockpot together for the afternoon.  Serve with shredded cheese in warm tortillas or over rice.