Oh, interesting. This is a lot more than the other dietary concerns I've been exposed to. And that would take some careful thinking and, like, choreography involved in the prep of the food, especially since you probably shouldn't even try to do it at the same time as the other food... it seems terribly unlikely that a big festive meal could be re-jiggered to be completely safe at the last minute like this. You'd have to go back to the planning stage, and possibly further if you need to rethink preparation tools and pots and pans... Barb seems inordinately optimistic about LW's organizational skills as well as how much trouble she'll want to go to.