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Put 350g thin-cut minute steak strips in a bowl and toss in 3 tbsp cornflour and 2 tsp Chinese five-spice powder.
Scoop out the beef and drain on kitchen paper. Pour away all but 1 tbsp oil.
Add 1 thinly sliced red pepper, ½ thinly sliced red chilli, sliced white ends of 4 spring onions, 2 crushed garlic cloves and thumb-sized piece ginger, cut into matchsticks, to the pan. Stir-fry for 3 mins to soften, but don’t let the garlic and ginger burn.
Mix the 4 tbsp rice wine vinegar or white wine vinegar, 1 tbsp soy sauce, 2 tbsp sweet chilli sauce and 2 tbsp tomato ketchup in a jug with 2 tbsp water, then pour over the veg.
Bubble for 2 mins, then add the beef back to the pan and toss well to coat.
Serve the beef on noodles with prawn crackers, if you like, scattered with the remaining ½ sliced red chilli and sliced green parts of the spring onions.