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For the Stuffing: Preheat oven to 400°F/200°C.
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Scatter the cubed bread on a rimmed half-sheet pan and bake until just beginning to dry out and turn golden brown, tossing during baking to toast evenly. Cool and place in a large mixing bowl and crush with hands until you have rough crumbs; set aside.
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Heat a large skillet over medium heat, add the Garlic-Infused Oil and sausage, squeezed out of its casing, breaking it up as you add it to the pan. Sauté until it loses its pink color, then use a slotted spoon to remove and add to the bowl of bread.
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Add squash, leek and scallion greens, chopped fennel, fennel seeds, thyme and sage to the pan, over low-medium heat, and sauté for several minutes (about 6 to 8) or until vegetables are softened, stirring often. Add the kale, butter and 1 cup (240 ml) of the stock (the rest is for later), turn heat up to medium, and sauté for several minutes or until kale is softened and most of the liquid is absorbed, but the mixture is still moist. Scrape mixture into bowl with bread and sausage, add parsley, season to taste with salt and pepper and combine very well (I like to use my hands) until evenly mixed. Add just enough of the reconstituted chicken stock to moisten (might just be 1/4 cup (60 ml) or so). Save remaining stock.
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For the Turkey: Spread the turkey out on a cutting board, skin side down. Peek underneath and make a mental note of which side the skin is on. Cover with plastic wrap and use a mallet to pound it out to a uniform thickness, about 1/2-inch (12 mm). Season with salt, pepper, thyme and sage. Use your hands to press the stuffing in an even layer all over the turkey, leaving a 1-inch (2.5 cm) border all around. Starting with the short end that does not have the skin begin rolling it up firmly into as even a log shape as possible. Take care with this step as it will effect how pretty the final dish looks and how easily it slices. Roll up the log in a large piece of double-layer cheesecloth. Tie both ends with kitchen twine, shaping plumping and the log as you go, keeping it nice and round. Tie twine crosswise around the turkey in 4 or 5 evenly spaced rotations, then slather butter evenly all over the cloth (use your hands).
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Place log seam side down in roasting pan and add enough reserved stock to come up the sides of the log about 1/4-inch (6 mm). Immediately turn oven down to 375°F/190°C and roast for about 60 minutes to 1 hour and 15 minutes, basting once or twice and adding more stock to pan if it evaporates. An instant read thermometer should read 155°F when inserted in center. Remove from oven, transfer to cutting board, drape loosely with foil and allow to rest for at least 15 minutes (temperature should rise to 165°F. Meanwhile, you can strain the pan juices, discard the fat and use to make gravy, if you like (highly recommended). Remove twine and cheesecloth, then slice crosswise in thick slices to serve immediately.