Cook spaghetti in salted water and oil for 5-7 minutes. Then drain and let it cool down. Clean, wash and cut the leek into fine strips. Briefly fry the leek strips and peas in hot fat.
Drain the mandarins, collecting the juice. Cut the ham into strips. Mix mayonnaise, yoghurt and mustard for the sauce. Season with salt, pepper, lemon juice and 3 tablespoons of tangerine juice.
Mix spaghetti, peanuts and all the prepared ingredients. Then mix with the sauce and leave to stand covered for at least 1 hour. Before serving, season the pasta salad to taste again.
Garnish with lemon slices.