1. Peel the shrimp, keeping the tail intact. Cut the bell pepper and carrot into very thin strips. Cut the leek into thin slices. Peel and grate the ginger. Peel and mince the garlic cloves.
2. Bring 2 liters of water to a boil, add the noodles and stir. Turn off the heat as soon as it starts boiling again and let it sit covered for 3 minutes. Drain the noodles, rinse them under cold water, and mix them to prevent sticking.
3. Heat 2 tsp of oil in a large skillet or wok. Sauté the garlic, ginger, leek, carrot strips, and bell pepper for about 5 minutes, adding 6 tbsp of water during cooking and stirring frequently. The vegetables should be just cooked and still slightly firm. Add the shrimp 1 minute before the end of cooking. Remove the vegetables and shrimp from the skillet and keep them warm.
4. Pour the remaining oil and sesame oil into the skillet, heat well, and stir-fry the noodles over high heat for 2 minutes, stirring constantly. Add the vegetables and shrimp, soy sauce, and lemon juice, and heat everything for 2 to 3 minutes, still stirring. Sprinkle with chopped cilantro before serving.