Fresh out of the oven, smoked turkey tetrazzini made with Greenberg turkey leftovers. (Photo ©Chris Wilkins/Texas BBQ Posse) One of the true joys of having a Greenberg smoked turkey for the holidays has always been the Greenberg turkey leftovers. I’ve been enjoying Greenbergs for most of my life and have probably eaten hundreds of post-holiday smoked turkey sandwiches on wheat bread, with a swipe of mayo. Ah, the simple pleasures of life. . . I’ve been lucky this year to have back-to-back turkeys. We ordered one for Thanksgiving and I picked up a second one on our recent tour of their…