Step 1

Mix all of the marinade ingredients in a bowl.

Step 2

Place the sliced beef in a second bowl and add one third of the marinade. Stir together and, cover and leave to marinate for 15-30 minutes. Cover the remaining sauce and put to one side.

Step 3

Meanwhile, cook the noodles according to pack instructions (usually boil for 5 mins), then drain in a colander and rinse in cold water until completely cold. Toss together with the 1 tsp of sesame oil and leave in the colander until needed.

Step 4

Heat 1 tbsp vegetable oil in a wok until smoking. Scoop out half of the beef from the bowl and fry on high for 2-3 minutes until just cooked. Remove from the wok and place in clean bowl, then repeat with the remaining beef.

Step 5

Add the remaining ½ tbsp oil to the wok and fry the onions for 2 minutes.

Step 6

Add in the yellow pepper and cook for 1 minute, then add in the reserved marinade/sauce and bring to the boil.

Step 7

Add in the noodles and beansprouts and cook for 3-4 minutes- tossing the noodles every so often (carefully so as not to break them) - until completely heated through.

Step 8

Add in the beef and cook for a further minute.

Step 9

At the last minute, stir in the spring onions (scallions) and spinach.

Step 10

Divide between four plates and serve topped with chilli slices and sesame seeds.