Ras ko garam hone ko rakhen.jab boil krne lage to flame slow kar dein aur ras ke oper kale rang ki foam si layer ayegi use puri nikakne wali channi s nikalte rahein..aisa ap ko jab tak kala foam ata hi krna hi.aisa krne s aap ke ras saf hoga aur ras kheer kali nahi banegi