Hello, first time posting here, apologies if there's already a thread on this, I couldn't find one!
My suggestion is to allow the use of juice, wine/mead/ale, and milk in certain meal recipes that call for either fruit or liquid. For example, you could use fruit juice in place of berries in a meat stew (perhaps 0.1 or 0.2l per serving), or you could use wine or milk in place of the water (1L per serving, like water) in soups. This would make it easier to put fruit, grain, or dairy nutrition into your diet, would make soup give more satiation overall, and would add more use to preserving fruits as juice or wine. Using ale as an ingredient would allow you to add grain nutrition to meals that otherwise couldn't have them instead of fruit. Cooking alcoholic beverages would remove most of its alcohol content, much like in real life, but could leave a small amount.
An additional suggestion would be to allow for the cooking of alcoholic beverages, to reduce their alcohol content before drinking. This would make them useful as a long term food without impairing you when consumed.
Also, you should be able to use mushrooms as the vegetable in pies.