1. Prepare short ribs: 2. Press peppercorns onto short ribs and put in a large roasting pan. Scatter thyme sprigs over ribs, then chill, covered, for 8 hours, or overnight. Remove thyme sprigs and reserve. 3. Preheat oven to 350°F. 4. Sprinkle ribs with Kosher salt. Heat oil in a deep 12 inch heavy skillet over moderately high heat until it is hot but not smoking. Brown the ribs in two batches on all sides, transferring meat sides up to a roasting pan. 5. Add onion, clelery, and carrot to the skillet and saute, stirring and scraping up the brown bits in pan, until the vegetables are golden brown, about 8 minutes. Add white wine, Port, vinegar, bay leaf, parsley, and reserved thyme sprigs and boil until mixture is reduced to about 3/4 cup, about 20 minutes. Add stock and bring to a boil, then ladles over short ribs in roasting pan (liquid will come about halfway up ribs). 6. Cover the pan tightly with 2 layers of foil and braise short ribs in the middle ot oven until meat is tender and almost falling off the bone, 2 to 3 hours (depending on the size of the ribs). Uncover roasting pan and roast ribs until they are slightly browned, about 15 minutes more. 7. Remove from oven, then tent with foil and let stand for 10 minutes. Transfer ribs to a platter and keep warm, covered. 8. Pour liquid in roasting pan through a fine sieve into a bowl, then skim off the fat. (Liquid should measure 1 cups, but you may have more. If so, transfer liquid to a small saucepan and boil until reduced to 1 cup.) 9. Make potato puree while short ribs braise: 10. Cover unpeeled potatoes with salted cold water by 1 inch in a 6 to 8 quart saucepan. Simmer potatoes, uncovered, until tender, about 25 minutes. Drain in a colander and cool 15 minutes, then peel potatoes while they are still very warm. Heat milk and cream until warm in a large heavy saucepan over low heat, then force peeled potatoes through a potato ricer into the saucepan. Add butter a few pieces at a time, stirring until incorporated before adding next few pieces. Season the puree with salt and keep warm, covered. 11. Prepare spinach while ribs are standing: 12. Heat olive oil in clean 12 inch heavy skillet over moderately high heat until hot but not smoking, then suate shallots, stirring, until golden, about 4 minutes. Add spinach and saute stirring, until just wilted, about 2 minutes. Season with salt. 13. Make horseradish cream: 14. Stir together creme fraiche and horseradish. 15. Serve each rib on potato puree with spinach, then drizzle with cooking liquid and top with a dollop of horseradish cream. 16. Cooks note: The ribs can be made one day ahead. Cool, uncovered, in roasting pan, then chill, covered. Reheat, covered, in a 350 F oven until heated through. ---------------------------------------------------------------------------
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