1/2 kg boneless chicken, cut into cubes1 tbsp of Soya sauce1/2 tsp Chinese salt1/4 tsp white pepper1 tsp white vinegarFor sauce:1/4 tsp white pepper1/4 tsp Chinese salt1/2 cup chicken stock1 tsp cornflour1 tsp Soya sauce1 tsp sugar1 tbsp tomato ketchup
Method: