According to our trusty "Food Lover's Companion," there are three ways you can tenderize meat chemically: long, slow cooking; use of a commercial meat tenderizer (Ac'cent is perhaps the best-known brand); or marinating in an acid-based marinade that contains enzymes, which break down connective tissue.
You will begin by pouring the sparkling water on the steaks and refrigerating them for one hour. Then you will dry the steak, and add the seasoning of your choice, and grill. The verdict is that the steak that was soaked in sparkling water is more tender. This is a great way to tenderize a cheap and tough cut of meat!