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["1.", "Heat a heavy saute pan over high heat and add the onion halves, cut side down.", "Cook until they blacken on their cut sides, about 10 minutes.", "2.", "Fill a stockpot halfway with water and set it over high heat.", "When the water boils, salt it well, then add the meat, onions, and 2 of the marrowbones.", "Reduce the heat to medium-low.", "Partially cover the pot and bring the water to a very low simmer; it should bubble only slightly for the duration of the cooking time.", "Simmer for 3 hours, checking on the meat periodically, turning it occasionally and adding a little more water if necessary to keep the meat covered.", "3.", "Add the carrots, turnips, kohlrabi, celery root, juniper berries, allspice berries, pepper, and bay leaf.", "Simmer until the vegetables are cooked, 20 to 30 minutes.", "Use a slotted spoon to transfer the vegetables to a platter as they become tender.", "Continue to cook the meat until there is no resistance when it is pierced in its center with a long fork yet it still retains its shape, another 30 minutes.", "4.", "Place the remaining 3 marrowbones, marrow sides up, in a saucepan.", "Cover with cold water, and add the thyme and garlic.", "Bring to a simmer, then remove from the heat and let the bones poach until the marrow is translucent and soft, about 5 minutes.", "Drain the bones.", "Slide a paring knife around the inside of the hole to gently push the marrow free, and cut the marrow into 1/2-inch slices.", "Reheat the marrow in a 250F oven or at a low setting in a microwave just before serving.", "5.", "Meanwhile, prepare the spinach puree: In a wide saucepan or saute pan, melt 3 tablespoons of the butter over medium heat.", "Let it cook until the white milk solids fall to the bottom and turn nut-brown, 2 to 3 minutes.", "Add the shallots and 1/2 teaspoon of the salt, and cook, stirring, until the shallots soften, 5 minutes.", "Add the garlic and continue to cook for 2 more minutes.", "6.", "Add the cream and thyme to the pan and bring the liquid to a boil.", "Simmer until reduced by one third, 3 to 4 minutes.", "Pour in the vegetable stock and let the liquid return to a boil.", "Add the spinach and cook gently, stirring and tossing, until it is tender, about 2 minutes.", "7.", "Remove the thyme.", "Use a slotted spoon to transfer the spinach to a blender or food processor, reserving 1/2 cup of the cooking liquid.", "Puree the spinach, and season it with the remaining 1/2 teaspoon salt, white pepper, a pinch of cayenne, and nutmeg to taste.", "If necessary, add some of the reserved cooking liquid so the puree is just loose enough to pour.", "Keep warm (or reheat gently before serving).", "8.", "Prepare the apple-horseradish sauce: Peel the apples, reserving the peels and submerging the apples in a bowl of water acidulated with the lemon juice.", "9.", "Place the apple peels in a small saucepan.", "Cover with 3/4 cup water and add the sugar, cinnamon stick, and clove.", "Bring to a boil and let simmer, stirring, until the sugar dissolves, about 5 minutes.", "Turn off the heat and let the peels steep in the liquid until cool.", "10.", "Place the horseradish in a large bowl and grate the apples finely over it.", "Strain the apple-peel liquid, and pour 1/2 cup of the liquid over the grated apple.", "Toss to combine.", "and add more horseradish if desired.", "Set aside.", "11.", "To prepare the chive mayonnaise, place the bread cubes in a bowl and cover with the milk.", "Let soak until soft, about 20 minutes.", "12.", "Use your hands to squeeze the milk from the bread cubes, and place them in a blender with the egg yolks, 1/4 cup broth taken from the kavalierspitz, chopped cornichons, creme fraiche, and sour cream.", "Blend to combine.", "With the motor running, add a few drops of Champagne vinegar, then drizzle in a small amount of the canola oil in a very thin stream, processing until the oil is absorbed before adding a little more vinegar.", "Continue alternating vinegar and oil until you have used it all.", "The mixture should be of a thick but pourable consistency, and just slightly piquant.", "Season it to taste with salt and white pepper, and set it aside.", "Just before serving, stir in the hard-cooked egg and chives.", "13.", "When the beef is tender, transfer it to a platter and cover it with plastic wrap.", "Strain the broth through a fine-mesh strainer.", "If you're not going to serve it immediately, place the beef in a clean pot, cover with the strained broth, and surround with the baby vegetables.", "Heat gently just before serving.", "14.", "To serve, slice the steak across the grain into 2-inch-wide pieces.", "Lay them in the center of each soup plate, and garnish with the baby vegetables.", "Ladle the cooking liquid on top of and around the meat.", "Garnish with a slice of bone marrow, and any or all of the garnishes (freshly grated horseradish, lovage, grated nutmeg, a sprinkle of fleur de sel, chopped chives).", "Serve with the spinach puree, apple horseradish sauce, and chive mayonnaise on the side.", """To elevate and refine this traditional dish, we paid close attention to every detail, using only the highest-quality ingredients and sophisticated techniques,"" says Lohninger.", "He prefers the Kavalierspitz, a tender cut from the shoulder, over the more common tafelspitz cut from the upper leg.", """This was Kaiser Franz Josef's favorite cut,"" says Lohninger.", """Because it has gelatin running through the middle, it stays very moist and juicy.""
