I am a homebrewer and brew all grain beer. As a byproduct of mashing 10+ lbs. of grain to make wort for beer, you have 10+ lbs. of grain to use. I hate to dispose of anything, especially food, I wanted to find a good way to use this leftover grain. I use some of the grain for this bread recipe and put the rest into compost for my outdoor plants. Really there is no true combination of grain, I just use whatever I used to brew beer with. It all gets mixed together during the mash so it is never the same blend, but that keeps it interesting!