Beef Steak Fajitas

Followed this steak fajitas recipe with what I have available on hand. 

Ingredients

Steak - 1 lb, flank or skirt steak

Oil - 1 TBSP 

Yellow onion - 1 large,  peeled and sliced with the grain
Bell peppers - 2-3 of various colors, stemmed, seeded, de-ribbed, sliced lengthwise into strips
Salt - to taste
【Marinade】
Juice of 1 lime/lemon
Olive oil - 2 TBSP
Garlic - 2 cloves, peeled, minced
Ground cumin - 1/2 tsp
Fresh jalapeño pepper - 1/2, seeded, ribs removed, finely chopped (omitted)
Fresh cilantro - 1/4 cup, chopped, including stems (omitted)

Steps

1. Mix all marinade ingredients. Coat the steak with the marinade and let it sit at room temperature for an hour, or longer in the fridge. 

2. Before you cook the meat, wipe off most of the marinade and sprinkle the steak with salt.
3. Set a large cast iron pan or griddle over high heat and let this heat up for 1-2 minutes. Add the tablespoon of oil to the pan and let this heat up for 1 minute. Add the steak, frying on each side for 3 minutes, or to desired doneness. Remove from pan and let sit, tented with foil, for 5 minutes. 

4. Cook the vegetables while the meat is resting. Add a little more oil to the pan if necessary, then add the onions and bell peppers. Cook for 5-6 minutes total.
5. Slice the meat across the grain into thin slices. Serve immediately with shredded cheese, salsa, shredded iceberg lettuce, sour cream, guacamole and warm flour tortillas.