Buckwheat flour is hard to make bread with, but tastes great once you get the proportions figured out. This is the recipe I use for my bread maker. comes out tall and a little bit lighter than other recipes.
2 Dissolve sugar and salt into your measured luke warm water.
3 Whip the egg yolk and whites (you can skip the yoke if preferred).
4. Combine the eggs and the rest of liquid ingredients in bowl and stir together.
5 Put all the liquid in the bottom of the maker and pour dry ingredients on top.
6 Make an indentation on top of the flour pile and place your 3t of yeast on top of the dry mix.
7 Set your machine to your regular bread recipe (or the one that does not pre-heat -- remember the recipes uses eggs the preheat will coagulate the egg protein). This is a 1K loaf so comes out pretty big. The loaf comes out pretty dark so if you have a crust color selector choose the lightest setting.