Zip sauce is a sauce served with beef in Detroit area restaurants. It's made of one part "Flavor Glow" to one part clarified butter, salt and pepper to taste.
NEWS FLASH:
You can now buy Zip Sauce by the bottle! See here:
Zip Sauce
"Flavor Glow" is a gravy base. It's generally sold only to restaurants, but this may be a source:
Nancy Jenkins
Sales Coordinator
Dean Distributors
1-800-792-0816, Ext. 113