Clean, wash and cut the beef into strips. Drain with paper towels and set aside.
Mix together all the ingredients of the first marinade except the flour and rub the beef pieces with it nicely. Set aside for 1/2 an hour.
Dust the marinated beef pieces with flour and deep fry them in oil till crisp. Drain on paper towels.
Meanwhile prepare the red sauce by combining all the sauce ingredients together.
Now toss the fried beef pieces in the red sauce and enjoy.
For the chilli garlic beef in glazed red sauce:
Follow the steps from 1 to 3
Heat 1 tsp of vegetable oil. Combine all the sauce ingredients (except for the red chilli flakes) with 1 tbs of ketchup and 1 tsp of hot chilli sauce (optional) and add to the sauce pan.
Dissolve 1 tsp of cornstarch in 1 tbs of water and add it to the red sauce to glaze it. Simmer till the sauce thickens a bit. If it becomes too thick add another tablespoon of water.
Toss in the fried beef. Sprinkle the red chilli flakes.
Garnish with chopped spring onions and serve hot with rice or noodles. You may also add thinly sliced red and green peppers to it.