I don't unfortunately know. Their Purpurhvedebrød [1] is very nice with walnuts and cranberries. It got me thinking I'd like to try making it. The recipe mentio

I don't unfortunately know. Their Purpurhvedebrød [1] is very nice with walnuts and cranberries. It got me thinking I'd like to try making it. The recipe mentions 'young sourdough'. [1] https://www.meyersmad.dk/lav-mad/opskrifter/purpurhvedebrod/ https://www.meyersmad.dk/lav-mad/opskrifter/purpurhvedebrod/