Step 1Blanch the rosemary in rapidly boiling water for 10 to 15 seconds. This will further tenderize the sprigs and will also make your kitchen smell great. Pat dry and set aside.
Step 2Remove the giblets and rinse the turkey thoroughly under cold, running water. If you want to brine it, do so the day before serving. Thoroughly pat the turkey dry with a tea towel. Pull up the skin covering the breast on both sides of the central "keel" bone. Do not remove the skin, just separate it from the meat enough so that you can stick your fingers in between. Do the same with the skin on the inside of the thighs.
Step 3Insert 2 sprigs of rosemary under the skin of each breast, being careful not to bend or break the stems. In the same manner, insert 1 sprig of rosemary under the skin of each thigh. If the turkey has not been brined, salt it well inside and out.
Step 4Heat the oven to 350 degrees.
Step 5Heat the butter, garlic and the juice and zest of the Meyer lemon in a small saucepan over medium-low heat until the garlic begins to soften and become fragrant, about 5 minutes. Remove from the heat, but keep warm while the turkey is roasting.
Step 6Place the turkey breast-side down on a rack in a shallow-sided roasting pan. Brush with the butter and begin roasting the turkey in the oven. After 30 minutes, baste the turkey once more with the butter mixture, then turn the turkey so the breast side is up. Brush the breast side with the butter and continue roasting, basting every 30 minutes, until a thermometer inserted in the deep part of the thigh registers 165 degrees.
Step 7While the turkey is roasting, blanch the whole heads of escarole in plenty of rapidly boiling water just long enough for them to soften slightly, 1 to 2 minutes. Drain and press them dry, and cut out the tough bottoms and chop coarsely. Set aside.
Step 8Remove the turkey from the oven, brush with butter once more, cover loosely with foil and set aside for 15 minutes to rest before carving. While the turkey is resting, pour off all but 2 tablespoons of the grease from the roasting pan and add the blanched, chopped escarole to the pan. Return the pan to the oven and roast, stirring occasionally, about 15 minutes.
Step 9Carve the turkey, reserving some of the juices. (Be sure to remove the rosemary sprigs after carving, unless you have guests who are very fond of the flavor.) Taste the escarole in the roasting pan and add salt and a generous grinding of pepper, some of the carving juices and more lemon juice as necessary. Neither the flavors of the turkey nor the lemon should be pronounced. Rather, they should be accents to the bittersweet flavor of the escarole.
Step 10Place the escarole in the center of the turkey platter, arrange the carved bird over it and serve.