To make the marinade, combine the oil, soy sauce, lime juice, chili powder, minced garlic, cumin, and oregano in a large bowl.
Stir until well mixed.
Add the steak pieces and place them in the refrigerator to marinate for 2-12 hours.
After marinating the meat, heat the other half of the oil in a frying pan and place the pieces of meat with the marinade into the hot skillet.
Let the marinade cook down, and test the meat for the desired doneness.
Serve in warm double tortillas, top with chopped red onions and cilantro, and squeeze the lime juice on them. Enjoy.