For the sauce:
1 tablespoon oil
1 clove garlic, minced
1 tablespoon whole fermented Black Beans
1 teaspoon Shaoxing wine
1 cup chicken stock
¼ teaspoon salt
¼ teaspoon sugar
1 teaspoon soy sauce
1 teaspoon oyster sauce
1 tablespoon cornstarch, mixed into a slurry with 1 tablespoon water