Here's one: Cooking has too many recipes right now. There shouldn't be six different stew recipes, there should be one stew recipe that takes (say) meat, flour, oil, and vegetables as input. The resulting calorie value, and perhaps bonus properties, should depend on what you add to it.

Acorn flour should be able to sub in for old mill flour.

I'd also say fish oil should work in lieu of cooking oil. Maybe some fish give you lantern oil, some fish give you cooking oil.

Edit: They added animal fat, which is cooking oil now. Good solution, though you now end up with a lot of useless animal fat. Unless you make a lot of pemmican...