This is a modification of a really wonderful recipe, Catfish Rounds Simmered in Turmeric-Flavored Coconut Sauce (Dtom Kem Gkati Bplah Doog) which is located here: http://www.thaifoodandtravel.com/recipes/turmcatcoc.html . I modified it to use ingredients which were more readily available to me. Fresh turmeric is available at indian groceries stores and Whole Foods (where I found it). Frozen stuff works well too and you can freeze the fresh stuff if you find it. The original recipe mentions the possibility of using 3 tsp. of powdered turmeric and add an extra 1/2 tsp. of sugar. I have not tried this and they mention that it won't be as good. I also cut down on the amount of fish sauce.