Carne Asada Tacos

Name: Carne Asada Tacos
Ingredients: One (12-ounce) jar sliced pickled jalapenos, drained; One (1 3/4-pound) flank steak,trimmed; Kosher salt and freshly ground pepper; 1/2 cup chopped white onion; 1/2 cup fresh cilantro; Lime wedges, for serving; 2 to 4 tablespoons Salsa (homemade, recipe follows, or store-bought); Corn tortillas (homemade, recipe follows, or store-bought); 4 dried arbol chiles, stemmed; 1 pound plum tomatoes, halved; 1/2 white onion, chopped; 1 clove garlic, minced; 1 teaspoon dried oregano (preferably Mexican); Juice of 1/2 lime; Pinch of sugar; Kosher salt; Fresh cilantro, for garnish; 1 3/4 cups masa harina (corn flour)