After traveling in Sri Lanka for a week we really missed the Indian food. We were happy to find Indian hut when we stayed in Unawatuna. You can take the tuk tuk or the local bus, from the Galle main station its just a 10 minute stroll to the Galle Dutch fort where they have a franchise. It comes across as a typical Indian restaurant, service is a bit on the low end but they make it up with the food. The curries are really tasty, naans are great too! We ended up ordering 2 curries and a naan each (2 persons) with some drinks and ended up with a 10 euro bill.
The location is really nice and if you come in at the right time you can get a table at the balcony which has a nice view to the ocean. We came back here twice and currently staying in Hikkaduwa contemplating if it's worth the 45 minute bus ride. Perhaps! :-)