Prepare the marinade for the steak and let it sit for at least an hour before grilling.  Bring the steak to room temperature for even cooking before grilling.

Preheat the grill to high heat.

Slice the peppers and onions

Once the grill is hot, place the marinated steak on the grill, flipping often until the steak reaches 170 degrees internal temperature.  Depending on the thickness of your steak, it could be 6-8 minutes per side.

Measure the internal temperature of the steak at the thickest part.

Heat a skillet over medium-high heat and add 1 tablespoon olive oil to the pan.  Once the oil is hot, add the sliced peppers and onions.

Season the vegetables with salt, pepper, oregano and a pinch of cumin.  Cook over medium-high heat for about 8 minutes.  Once the vegetables are soft and slightly charred on the edges, remove from the heat.

Slice the steak think against the grain.

Serve in warmed tortillas with the peppers, onions and your choice of toppings like sour cream, avocados, salsa and cheese.