Heat a wok until smoking hot. Add the vegetable oil, then add the beef strips. Stir fry until the meat has browned, then add the julienne peppers. Stir fry for 2 minutes, then add half of the spring onions.

Add the soy sauces, sugar, ginger, garlic, and noodles. Stir fry until the noodles have separated and everything is coated in the sauce. Turn off the heat, then sprinkle over the rest of the spring onions.

Heat a small pan on low heat. Add the sesame seeds to the dry pan and lightly toast them. Turn off the heat when the seeds are golden brown.

Serve the stir fry and garnish with toasted sesame seeds.