Prepare all of the marinade ingredients and combine to make marinade.
Cut flap meat into 2 or 3 sections and lay in a shallow baking dish
Pour entire marinade over the flap steak, cover, and refrigerate for at least 4 hours.
Cooking the carne asada
Preheat traeger grill to 425*F
When the traeger has reached 425*, lady each piece of the flap steak on the grill, close the lid, and cook for 10 minutes. Flip the steak one time halfway through.
Remove the steak and allow to rest on a large cutting board for 5 minutes.
Thinly slice the carne asada on a bias, against the grain.
Serve with your choice of tortillas and taco fixings, Mexican rice, blacks beans, avocado salsa, or elote corn.