We all know that smell. It’s the smell that arrives before the guests do—the one that seeps through the walls and into memory. Cinnamon, clove, allspice, sugar. It’s the smell of the year turning toward the light again. Thanksgiving has a dozen good smells—roasted everything, butter, sage—but Christmas? Christmas owns a single, unmistakable note. It’s the scent that flips a switch in your brain and whispers, you’ve made it through another winter. I’m a foodie and a nerd—so, a