To help you out, here is a marinade recipe that I use for
the "cheap" cuts of beef and pork:

1/2 cup soy sauce

2 tablespoons brown sugar

1/2 teaspoon ginger

2 tablespoons Worcestershire Sauce

3 tablespoons Pineapple Juice

Just whisk it all together and pour over your meat. Let
sit in fridge, turning occasionally, for a couple of hours.