Trim fat from steak. Pound lightly to tenderize. Place meat in non-metallic container. Top with onion rings. Combine remaining ingredients. Pour over meat and onions. Cover and refrigerate overnight. Next day remove the meat and onions, reserving the marinade. Separate the meat and onions. Place meat on grill, basting often with the marinade and turning often to prevent charring. You gotta do this on a grill - its not the same in a broiler. Meanwhile, saute the onions in butter. When the meats done, slice it into strips, cutting across the grain. Serve with homemade refried beans, Mexican rice, guacamole, picante sauce or salsa, sour cream, grated cheddar, and of course, warm flour tortillas. Bubba uses handmade tortillas he gets from a nearby restaurant. Theyre much better than store bought. (Hint: I like this recipe is even better with chicken, but dont tell Bubba I said that, cause he thinks real men eat beef, and only sissies eat chicken!) ...Bill/Dallas...04/22 05:25 CST FROM: Posted to MM-Recipes Digest V4 #148 by Steve & Sharon Mehl on May 28, 1997