I like how cookbook help user with recipe without wiki digging. However I still feel cookbook's usefulness is not that great still. I don't see anyone use it. So here a small suggestion that I'd love to have: making cookbook interact with crockpot, user who open a crockpot and have a cookbook in the inventory can choose the cookbook and pick a recipe in there, the crockpot will automatically cook that recipe, if all the ingredients is in player inventory. This save time if you try to use multiple crockpot or have many different ingredients in a dish
This will give player incentive to fill out the cookbook more, or even make the thing in the first place