Beef Chow Fun

Name: Beef Chow Fun
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: Asian
Ingredients: 2 tbsp light soy sauce; 2 tbsps dark soy sauce; 2 tbsp oyster sauce; 1 tsp sesame oil; 1 tbsp brown sugar; 1 tbsp rice vinegar; 1 tsp minced ginger; 3 garlic cloves (peeled and minced); 1 tbsp Sriracha (or other chilli sauce (optional)); ¼ tsp white pepper; 1.1 lb (500g) Denver or skirt/flank steak, cut into strips (cut against the grain); 7 oz (200g) uncooked flat rice noodles; 1 tsp sesame oil; 2 1/2 tbsp vegetable oil; ½ a white or brown onion (peeled and sliced); 1 yellow bell pepper (deseeded and sliced); 2 cups (200g) fresh bean sprouts (or 1 can of canned beansprouts, drained); 4 spring onions (/scallions, sliced into long, thin strips); 2 cups (60g) fresh baby spinach leaves; 1 red chilli (thinly sliced); 1 tbsp sesame seeds ((I use a mixture of black and white sesame seeds))