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Preheat the grill or broiler.
Season both sides of the steak with salt and pepper and place on a hot grill or under the broiler. Cook the steak for 5 to 6 minutes on each side (for medium rare), and then chop into 1/4-inch pieces.
Heat a small saute pan and add 1 tablespoon canola oil. Warm corn tortillas for 30 seconds on each side, adding more oil as necessary. Stack 2 tortillas together, place the meat in the center of the tortillas and top with the onion and cilantro. Drizzle a teaspoon of the salsa de arbol on top of each taco.