Boil the potatoes and peel them (I usually microwave them for 7 mins).
Grind the coconut, pottukadalai (or Almonds) & green chillies to a paste with a tiny splash of water.
Heat oil in a big pan, season with mustard and cumin seeds, then add the minced ginger and garlic, quickly followed by the chopped kale. Saute this until the greens wilt a bit. Cover and allow them to cook for about 10 mins or so.
Now add the turmeric powder, salt and chilli/sambar powder followed by cubes of potatoes.
Cook them for a few minutes together before adding the ground coconut paste.
Keep roasting this on a medium flame until the potatoes and kale are completely done (another 5 to 7 mins) & dry.