1.  always place curry leaves in muslin wet cloth in refrigerator for fresh n soft leaves
   
2. always put a used lemon in pressure coocker while cooking rice and any type of lentil  ...it will help to  cooker  clean
                                                                                                           don't worry if u forgot to place lemon ... u can add pinch of citric acid and 1 glass water in empty coocker  n keep boiling it for 15 minute then swich off the flame and then wash d coocker with soap n rub it with hard sponge or iron wire