Wash the beans first then break both the ends of the beans by pulling it downwards, which will help remove the tough strings that run by the sides of the beans.
Snap the beans into 3 or 4 pieces then split each piece into two vertically using a knife. You don't have to split it into two vertically if you don't want to. I like them split, this way the beans cooks much faster.
Next, lower the heat to medium/low and combine the diced tomatoes, turmeric powder, curry powder, a pinch of chilli powder, as well as the prepped beans and diced small potatoes.
Sprinkle salt for seasoning then give it a good mix for the spices to coat well with the rest of the ingredients. Let it cook with the lids covered for about 10min
NOTE - If at any point it becomes smoky, lower the heat level. Add a tbs of water or olive oil to it only if it looks dry and burned on the bottom. If not continue to cook with the lids covered on low heat.
When the beans or potatoes looks cooked add the sliced green chilli, Maldives dry fish (optional) and as well as the coconut milk. Give it a good mix and let it cook for another minute or two then turn off the stove.