Greenberg Smoked Turkeys in Tyler, Texas, is a company that doesn't know the meaning of diversification. Since 1937, the Greenberg family has been smoking and selling one item: turkey. Turkey with no nitrites. Turkey not vacuum-packed. Turkey cured exactly the way founder Sam Greenberg did it when he smoked his first bird all those years ago in the same place, which was then his dairy farm. The turkeys are hand-rubbed, inside and out, with a secret seasoning mixture of salt and spices, then slowly smoked over hickory wood in one of the company's ten brick smokehouses. The birds, like almost all mail-order poultry, are then frozen for shipping. They arrive triple wrapped: in a plastic bag, then in a paper sack, then in an insulated cardboard box. From raw bird to boxed bird, the process takes four days.