Best place for an authentic Sri Lankan cooking class not a touristy one

The most authentic classes are the small home-kitchen ones where you start at the market buying vegetables and grinding fresh spices, then cook 6 to 8 curries on a clay stove. These are common around Galle/Unawatuna, Ella, Mirissa and Sigiriya, usually run by a family rather than a hotel. Expect roughly 25 to 45 USD per person including the full meal you cook. Hoppers and kottu are usually demonstrated since they need special pans and the chopping rhythm. Avoid the big resort "demonstrations"; look for a class capped at a handful of guests in a real home.