This is a great marinade/tenderizer for cheaper cuts of roasts like chuck etc, it really does a wonderful job of tenderizing! Powdered meat tenderizer can be found in the spice section (I buy Club House powdered meat enderizer, it is sold in a 270-gram spice bottle). Plan ahead the roast needs to marinade overnight. Do not add any salt in with the marinade as it will effect the tenderizing process, salt the roast just before cooking. When ready to cook, make certain to leave the roast out for 1 hour at room temperature before cooking. This works good on pork roasts also. Cooking time is 24 hours marinating time.