Years ago, I had this great recipe from Gourmet for almond toffee which I'd make for my dad every Christmas. I'd copied the recipe from my mother who had copied it from a magazine which had belonged to a friend. My copy lived on an old bank envelope push pinned to a bulletin board in my NYC kitchen. When I moved, I carefully put this beloved recipe into my Joy of Cooking, where I could find it. And did find it, returning it to the JOC, for years. Until we redid the kitchen. Then, I lost it. And have spent more time than I want to think trying to recreate it.
I never ever have.