CUCUMBER DAL (DOSAKAYA PAPPU)

INGREDIENTS  :
Toor dal   :1 small cup
cucumber   :1
onion           :1
dry red chillies  :2
salt                :to taste
cumin            :1/2 tsp
mustard         :1/2 tsp
hing               :a pinch
oil                  :3 tsp
garlic  pods         :2 
curry leaves        :a few
 chilli powder  : 1 tsp

METHOD  :
In a pressure cooker add dal,water to it.
 Add peeled and chopped cucumber pieces,onion and place that bowl in a pressure cooker with dal, turn on heat and let it cook upto 4 or 5 whistles.
Heat oil in a pan add cumin,mustard seeds,red chillies,curry leaves,garlic,hing and then add this tadka to the cooked dal.
Add chilli powder,salt to it and let it cook for 5  to 10 min and turn off the heat.
Serve hot with rice .