
In Central Kerala, or at least in the town I grew up, Kachiya Moru, is the seasoned spiced up buttermilk curry, a regular comfort side dish paired up with fried fish. Some refer the same as 'Moru Curry', though a few claim 'Moru Curry' demands the addition of ground coconut with spices. Kachiya means boiled and Moru, butter milk.
There are versions wherein tomatoes, garlic and chilly powder...