Beef Satay With Spicy Peanut Sauce

2 pounds beef rump -- round or chuck,

-- sliced 1/4" thick

1/2 cup soy sauce

2 tablespoons sherry

1 inch ginger -- chopped

1 onion -- sliced thin

1 clove garlic -- chopped

**spicy peanut sauce**

1 cup smooth peanut butter

2 tablespoons soy sauce

1 tablespoon sugar

2 tablespoons rice wine

1 1/2 tablespoons Chinese vinegar

1/4 cup sesame oil

1 clove garlic -- minced

1 tablespoon minced ginger

1 teaspoon chili paste

3 tablespoons chicken broth or water -- up to