Try pineapple in the dogs food or a bit of meat tenderizer in food. (caninejournal.com)
At Ships Coffee Shop in Culver City, that meant including statements such as «We don't use substitutes or resort to any tricks in food preparation, such as meat tenderizer or strong condiments» on the back of its 1971 menu. (bonappetit.com)
Slice chicken breast into thin slices then beat them gently with meat tenderizer to make it soft. (ketovale.com)