It's called "Westchester Grocery,"(546 Commerce Street, Thornwood,) and it's actually Pakistani, but has some of the best Indian-like food I have ever tasted. The spices are strong yet delicate---The kind of spicy that doesn't hit you until long after you've tasted the food, but then it really hits you.
The family who runs it speak no English, but you can point to pre-made trays behind a counter, and they don't mind giving you tastes(The store is a bodega that sells indian spices and is completely out of place in its mid-westchester location.)
I often get the Chicken Mahkni, which is similiar to Chicken Tikka Masala, but there's food there that I can't pronounce the name but is unbelieveably good.
The Chicken Tikka is excellent, as is the barbecued lamb sausage.
The other thing is it's incredibly cheap. Most of the dishes cost under $4.
I have been reading chowhound for years, but have never made a post. I thought this was such a terrific discovery that it required a mention.
I feel very lucky to have found it.