Heat oil in a kadai or pan , add mustard seeds , jeera / cumin seeds and wait till it to crackles.
Add Chana dal , urad dal and fry till it starts to change colour. curry leaves , broken red chilies.
Now add in dry red chilies broken , curry leaves , hing , slit green chilies and grated ginger , saute for a minute.
Add 1/4 cup of green peas and saute for 2-3 minutes . You can even use fresh green peas , blanch and use.
Add 1/2 tsp Turmeric powder and mix well.
Add 11/2 cup water , pinch of salt and continue to cook till peas are done.
Keep on medium heat , add in fried gram paste and stir well.
Add roughly mashed potatoes and mix well.
Add salt to taste
Cook till it reaches the desired consistency. If it becomes more thick add 1/2 cup of more water and mix well. It thickens a bit more even after cooling , so when it comes boil , turn off the stove immediately.
Add chopped coriander leaves and squeeze in lime juice.
Mix well and serve with any rava idli.