Boil spaghetti with little salt,drain,set aside.Marinate beef,boil and fry,dice it,set aside.Make sauce with puree,pour oil into a dry pot,heat,saute onions,pour puree,stir fry for 2mins,add little beef stock,taste to adjust with salt,pour in spaghetti and diced beef,stir,cook for 1minute,wash cucumber with salt water,rinse with water again,slice as desired.Ganish food with it....ready to eat...