A well-prepared turducken is a marvelous treat, a free-form poultry terrine layered with flavorful stuffing and moistened with duck fat. When it's assembled, it looks like a turkey and it roasts like a turkey, but when you go to carve it, you can slice through it like a loaf of bread. In each slice you get a little bit of everything: white meat from the breast, dark meat from the legs, duck, carrots, bits of sausage, bread, herbs, juices and chicken, too. Although smoking turducken on my…