Black Pepper Beef and Broccoli Noodles

Name: Black Pepper Beef and Broccoli Noodles
Ingredients: 1 cup Beef Stock; 2 tbsp Oyster Sauce; 2 tbsp Dark Soy Sauce; 1 tbsp White Rice Vinegar; 1 packed tbsp Brown Sugar; 1 tbsp Cornstarch/Cornflour; 250-300 g Broccoli (diced into bite-sized pieces); 300 g Steak (sliced into thin strips); 2 packs Udon Noodles (straight to wok noodles); 2 tsp Black Pepper; 1 medium White Onion (sliced into thin strips); 2 cloves Garlic; 1 tsp Ginger (finely grated/diced); 1 tbsp Sesame Oil; as needed Vegetable Oil; finely sliced Spring Onion; Sesame Seeds Sesame Seeds