A Drizzle of Honey is a collection of recipes redacted (by modern scholars) from expulsion-era Spain based on, of all things, inquisition testimony. All redaction from just ingredients lists is speculative, but these ring true based on other renaissance cooking research I've seen. I've made several of the recipes in this book with generally-good results; when I didn't care for the dish it was because I didn't care for the dish, not because the recipe was fundamentally flawed. (I am an hobbyist in medieval and renaissance cooking, a fact that I never would have expected to be relevant on Mi Yodeya. :-) )
Obviously that's not as old as reconstructions from Rashi or the talmud would be, but I don't know of any of those with enough information to form a real recipe.