An easy-to-follow recipe for restaurant-quality beef fajitas.
Combine all ingredients for marinade and whisk until well incorporated. Add meat to a large plastic bag, then pour marinade over steak. Refrigerate and marinade for 4 to 12 hours.
Combine ingredients for veggie sauce and mix well.
Warm grill or grill pan up to medium-high. Place steak in warmed pan or grill (discard marinade) and cook until medium doneness. Remove and let rest on cutting board for 5 minutes. Slice against the grain into thin strips.
In grill pan or skillet, sauté onion, pepper and jalapenos until almost brown and soft. Add tomatoes and cook an additional 1-2 minutes. Pour sauce over veggies, and add sliced steak. Reduce heat to low, then stir.