This delicious whole grain sourdough bread contains a combination of buckwheat and hard white spring wheat. The buckwheat can be incorporated into the dough as a porridge partway through the first rise, or as flour in the initial dough mix. You choose whether you want to taste and see the different elements more distinctly (porridge) or in a more blended way (flour).

https://breadtopia.com/buckwheat-porridge-vs-buckwheat-flour-in-bread/