Cabbage - would be cool to have in the game, you harvest it like pumpkin (except it takes 2x2 space), shred it into pieces. Good to feed animals. Nice refreshing vegetable, providing good enough energy % , yet not so many FEP's.
Shredded cabbage pieces could be placed in barrels, applied with spices, maybe some ferment, or some carrots (slavic style), or apples.. and turned into sourkraut after some time (just like turning grape juice into wine). Easier to digest, more FEP's. However historically this preparation appeared in Europe quite late, so wouldn't fit so well in HnH setting.
Poppy pod extract. Opium was a blast during ancient Rome times. Less popular after all that empire collapse. Buuut.. Think about it. Poppy pods could be ground and used in cauldron and boiled enough to make extract. Dried up in herbalist table after, making it good enough to smoke. It could be great pain reliever, resulting in faster healing of wounds. (I noticed developers looks at wound system very seriously.)
Poppy pods could be dried up for making tea. That tea would be different, instead of providing pure energy.. giving some other buff. (Getting rid of travel weariness, or improving sleep, if these will be introduced).
Just some ideas.