Chestnuts are great for any Christmastime dessert. This chestnut mousse is lush and creamy. To peel chestnuts, first score them by making an "X" in the shell with a small, sharp knife. Then roast them in a 550-degree oven for about 15 minutes, cover them in a towel that's been soaked in ice water until they're cool enough to peel , and their shell and skin are fairly easy to remove. It's a technique from "Roger Verge's Vegetables in the French Style." From the story: Fabulously festive, in a…