Season steak liberally with a mixture of meat tenderizer, Accent® and Season-All®. Let steak steep in this seasoning for at least 1 hour, and preferably several hours. Make sauce.
Grill steak over hot charcoal. Baste with the sauce, turning steak only once. Do not use a utensil that will pierce the steak. Serve the steak with the remaining sauce.
Sauce 1/2 pound butter 1 cup brown sugar, firmly packed 1 cup sherry wine 2 (3 ounce) cans button mushrooms, with juice 1/2 teaspoon Accent®
Melt butter, then add remaining ingredients. Bring sauce to simmer, then cook 30 minutes.
