Guinness Multi-Grain Potato Bread

I’ve made breads in the past using Guinness but I have to say this version by far was the best one yet. I combined fresh milled rye, spelt and whole wheat which were all sifted to a high extraction. I added some mashed potatoes with a little bit of honey and some olive oil for good measure.
A double build was used for the levain but you could easily just do one build if you desire.