Stir the sauce ingredients together in a small bowl and set aside.
Place noodles in a bowl. Pour boiling water straight from the kettle over the noodles, pop a plate over the top and leave to soak while you cook the stir fry.
Heat the oil in a large frying pan or wok and add the beef. Stir over a high heat for 4-5 minutes.
Stir the noodles with a fork to make sure they are softening evenly.
Add the broccoli and mangetout and cook for a further 4-5 minutes until softened a little.
Drain the noodles and add to the pan. Add the sauce and heat, coating the ingredients.
Stir well and serve with the chopped spring onions and sesame seeds.
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