In a mixer grind together coconut, ginger and green chillies using a little curd.
Peel and cube cucumber.
In a pan add the cucumber cubes and a little water and cover and cook until tender.
Add the paste and salt and mix well.
Cook until it becomes thick.
Finally add the remaining curd and remove from flame.
In a pan add oil and add the tempering ingredients.
When they crackle, pour it on the pachadi and mix.
Serve with rice.