Vathal puli kulambu , famous curry from tammilnadu which is spicy and tangy. I should say it is Finger licking+ mouth watering curry for hot rice to serve as lunch or dinner. Here is vieeo + text recipe. click the link below.
http://deepskitchen1.blogspot.com/2015/10/vathal-puli-kulam-spicy-and-tangy-curry.html