Beef, mushroom and broccoli stir fry

Boil broccoli for 3 mins then set aside.
Thinly slice steak.
Stir fry garlic, onion, beef and mushrooms.
Add a mixture of 2 tsp cornflour, 3 tbsp soy sauce, 2 tsp vinegar, 2 tsp oil and 5 spice powder.
Add broccoli for 1-2 mins.
Serve with rice or noodles.