Stuffed Dhokla idli

INGREDIENTS 
 
FOR DOUGH
1) Boiled Potatoes - 4 
2) Gram flour - 200 gms
3) Turmeric Powder- - 1/4 tsp
4) salt to taste
5) ginger paste - 1 tsp
6) chopped green chillies -2
7) lemon  - 1 
8) curd - 1/4 th cup
9) mustard seeds - 2 tsp
10) red chilli Powder- 1 tsp
11) coriander powder - 1 tsp
12) garam masala -1 tsp
13) black pepper powder - 1/2 tsp
14) curry leaves 
15) coriander leaves 
16) Grated Coconut 
17) Eno ( Fruit Salt )
18) Oil