I used Earth Balance margarine and added 1/4 tsp salt. Left out orange rind, but would add vanilla next time, for a little more flavor. I used 1/2 C arrowroot and 1/2 C potato starch. Would also increase the choc. chips. This makes a crispy cookie that doesn't taste like buckwheat at all. They went 17 minutes on my stone and 13 minutes on my aluminum. Held together nicely too.
I really mean this 5 stars. We enjoyed these cookies immensely even though I overcooked them a little. And Jubes is right, they do spread. We didn't have any orange or choc chips so used coconut essence instead and they were still lovely. What I like about them too, is the buckwheat flour, it makes them a protein filled cookie and the taste and texture I found no different to ordinary home made cookies. Well done.