Kasha Graham Porridge Loaf With Remarkably Open Crumb

A few days ago I posted about a loaf of bread that included cooked oatmeal and graham flour (see https://www.thefreshloaf.com/node/73391/oatmeal-graham-flour-sourdough-pullman-bread). I wanted to try it with buckwheat, and I found a box of Wolff kasha, which are toasted buckwheat groats. Perfect!