Instead of making bread, they likely prepared porridge or gruel from the grains ... DOI: 10.1007/s00334-024-01020-9 View 3D images of 11 different grindings stones from the Frydenlund site ...
Gruel is a Common Food found in Baldur's Gate 3. It counts as 2 Camp Supplies and can be selected or used automatically when resting. This watery sludge slowly drips of your spoon.