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.
500 g (1.1 lbs) Denver or skirt/flank steak
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.
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 a clean bowl, then repeat with the remaining beef.
2 1/2 tbsp vegetable oil
Add the remaining ½ tbsp oil to the wok and fry the onions for 2 minutes.
½ a white or brown onion
Add in the yellow pepper and cook for 1 minute, then add in the reserved marinade/sauce and bring to the boil.
1 yellow bell pepper
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.
200 g (2 cups) fresh bean sprouts
Add in the beef and cook for a further minute.
At the last minute, stir in the spring onions (scallions) and spinach.
4 spring onions/scallions, 60 g (2 cups) fresh baby spinach leaves
Divide between four plates and serve topped with chilli slices and sesame seeds.
1 red chilli, 1 tbsp sesame seeds
Video
Notes
Can I make it gluten-free?Yes! Ensure your rice noodles are gluten-free (rice noodles should technically be gluten-free, but some brands add wheat flour, so it's a good idea to check your brand). Replace the soy sauce with tamari and use gluten-free oyster sauce. Check your sriracha brand too, to ensure it's gluten-free (it usually is).Can I use chicken instead?Yes, you can use chicken or pork for this stir-fry. Replace the amounts like-for-like and follow the recipe in the same way.Can I make it ahead?I recommend eating this stir-fry right away. Cooking ahead and reheating the stir fry can cause the noodles to stick together and the meat to be chewier.What other veggies could I add?Add any other stir fry veg you like - broccoli, babycorn, carrot, bamboo shoots are all great additions.Nutritional Information is per serving.