Arachu kalaki is a very popular dish from kerala. As I belong to Tirunelveli in tamil nadu, we have some dishes from kerala in our staple diet like Olan which I had posted ages ago.
This is made from small(really small) raw mangoes which is mixed with rock salt and chilly powder in a barani( container for pickles especially). As it ages, the salt brings out the water, the raw mango shrinks, softens, absorbs the flavours making it suitable for consumption. I will try to post the recipe for this pickle sometime in future.
So then whenever poricha kuzhumbu (my hubby calls it poricha kootu, I think natives from Tanjore call it that way) is made, arachu kalaki is a surely prepared along with it.We used to love it when mom made this when we were kids. When I got a bottle of maavadu /vadu maangai from our relatives sometime ago, I make it a point to make this along with poricha kuzhumbu( have made it several times by now actually). And I was quite excited when I made this for the first time.
It is really delicious and makes a excellent side dish.