Pressure cook potatoes for 5 minutes. Cool, peel and keep aside.
Drain the soaked peas. Wash well and pressure cook for 7 minutes with 3 cups of water. The skins will come off during this process and some of the peas may get mushy. Don't worry about this, use the entire lot for the recipe.
In a large bowl, mash the potatoes along with other 'Patties' ingredients and half the ground masala. If the 'dough' is not firm enough to make patties, then add some more bread crumbs to adjust. Divide into 6-8 balls. Flatten on the palm to make patties of around half inch thickness.
Heat a non-stick tava (skillet). Brush with olive oil and place all the patties (or in batches if your tava does not accomadate all) On a medium flame, crisp each side for around 5 minutes, till golden brown. Use some oil around the sides to help crisp up.
For the ragda (gravy), place the pressure cooked peas in a saucepan with the remaining ground masala and coriander powder, amchoor powder, salt. Bring this to a simmer. Check for salt and adjust.