Try this delicious cake recipe:
Boil milk, pour in groats, swell for 20 min, add light butter and cool.
Beat egg yolks and sugar until creamy, fold in cinnamon and nuts, and buckwheat groats.
Whip egg whites to stiff peaks and fold into batter. Rinse blueberries, drain and fold into batter.
Fill the cake batter into a loaf pan lined with parchment paper. Bake at 180 degrees for 60-70 minutes.