1. For the oyster steak option: Preheat oven to broil. In a medium-sized shallow dish, combine the rest of the ingredients. Add steak and turn to coat. Marinate for at least 30 minutes, then place on a broiler pan.
2. Broil steaks on top oven rack for seven minutes per side. Remove from oven and cover with foil; allow to cool. Slice meat into thin, oval slices, and cut larger slices in half. Pour pan juices over meat and mix together until juice coats steak and gets absorbed into the meat.
3. For the ground beef option: In a large frying pan, sauté onions in oil until translucent and beginning to turn golden. Add garlic cube and sauté a few minutes longer. Add beef and sauté, stirring to brown evenly and break up clumps. Add salt, hoisin sauce, and steak spice and mix to combine. Add water-cornstarch mixture and bring to a boil; simmer until slightly thickened.