How to make crunchy dry vegetable sabzi (sukavni)?

Ingredients
String beans (chawli)........................................1 cup 
Cluster beans (gawar)......................................1 1/2 cup
Green chilies...................................................20 pc
Curd..............................................................1 cup
Red chili powder............................................1/2 tsp
Cumin powder...............................................1/2 tsp
Coriander powder.........................................1/2 tsp
Oil for frying
Salt to taste

Method

1. Add 1 cup water in curd and churn it well to make buttermilk.

2. Wash the vegetables and pat them dry. Soak these vegetables in the buttermilk and leave it for 1 or 2 days.

3. Take out the vegetables from buttermilk and sun dry for 4-5 days.

4. Deep-fry these vegetables just before serving.

5. Remove and sprinkle salt, coriander powder, cumin powder and red chili powder. Serve hot with other meal.