Bring a pan filled with water to a boil and cook the noodles according to package instructions. Drain.
Meanwhile, heat some oil in a wok until it is hot.
Pat the steak dry, sprinkle with salt and pepper to taste and fry the steaks 6 minutes in the wok over medium heat. Turn after 3 minutes.
Remove the steaks from the pan, place on a plate and cover with aluminum foil. Let the meat rest.
Put the cauliflower with garlic and ginger to the pan and stir-fry for 3 minutes.
Add the peas and stir-fry another minute.
Pour in the hoisin sauce and stir fry it for 2 minutes more.
Mix the noodles with the vegetables and turn of the heat.
Taste and season with salt and pepper.
Sprinkle some sesame oil on top of the noodles and divide among 4 plates.
Cut the steak into thin strips and place them on top of the noodles.
Serve with a slice of lemon.