Prior to starting, make the Parsi Green Chutney using the link to the recipe mentioned in the post. You can also use any leftover coriander, mint & coconut based chutney that you may have at home should you wish
Heat oil in pan on a medium flame and add the chopped onions. Toss for a few minutes till brown
Roughly chop the potatoes and add to the pan. Also add a cup of water so that the potatoes are immersed. Cover and cook till soft. Keep adding very small amounts of water to the pan (if need be) so the potatoes don't burn or stick to the bottom of pan
Once the potatoes are cooked through , mix in the baby prawns (shrimp) and cook uncovered on a medium flame
Add the green chutney mixture and stir well so the shrimps and potatoes are evenly coated
Once the prawns are cooked through, taste for salt and then remove from flame and serve with hot chapatis