Instructions

Combine onion, orange juice, salt and pepper and pour over steak. Set aside to marinate at least 4 or up to 8 hours. (Do not marinate overnight; meat will become mushy.)

In a blender, combine jalapeños, scallions, cilantro, 2 tablespoons water, vinegar, lime juice and salt. Blend until smooth. Refrigerate until ready to serve, up to 8 hours. Taste for salt, vinegar and lime before serving.

Heat a grill to very hot. Lift steaks out of marinade, season with salt and pepper to taste, and cook without moving until dark brown and crusty on bottom, about 10 minutes. Turn and continue cooking 5 to 10 minutes more, depending on preferred doneness. Serve steaks with sauce.