This was in miscellaneous help, but I thought it was worth cross-posting here: when your witch attains a skill level where she can cast Restoration Ritual, if you want to use the spell, be sure to not put your leftovers away anymore. Restoration Ritual will refresh food left on a counter, returning it to its unspoiled quality, but (until EA fixes this "feature") prepared food in the fridge will drop from its original quality to Normal, and will spoil quickly after being removed (as with the Eat Leftover... action).
Bon Apetit!