Thoroughly clean the beef and pat dry.
Add Cornstarch and mix until the beef is covered with cornstarch.
Heat olive oil and fry the beef until brown and set a side.
Add star anise, Chinese Five Spice Powder and ginger. Sauté for 5 minutes.
Add garlic and onion and sauté until cooked.
Add in the beef, beef bouillon cube, shiitake mushrooms, soy sauce, brown sugar and ground black pepper. Stir fry from 3 minutes.
Combine the syrup from the canned shiitake mushroom and water to make 2 cups of solution. Add the solution into the stir fried mixture. Boil and simmer until the beef is tender. Add more water if needed. Season with salt if needed.
Garnish with Bok Choy.