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1
Place racks in upper and lower thirds of oven and preheat to 275u00b0F. Slice garlic, sprinkle with salt, and mash to a paste on a cutting board using the side of a chef's knife; place in a small bowl. Mix in rosemary, oil, soy sauce, and red pepper flakes.
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2
Season ribs generously with salt and pepper and place in a medium cast-iron skillet. Coat all over with garlic paste and cover skillet tightly with foil. Cook on upper rack in oven, checking for doneness after 1 1/2 hours, until meat is fork-tender and falling off the bone, 2 1/2-3 hours. Remove from oven.
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3
Meanwhile, place cauliflower in a small baking dish. Rub all over with oil; season with salt and pepper. Cover with foil and place in oven next to ribs. Bake until cauliflower is very easily pierced with a paring knife, 1 1/2-2 1/2 hours.
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4
Transfer hot cauliflower to a blender and add cream. Blend until very smooth; season with salt and pepper. Place in a medium saucepan and keep warm over low heat.
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5
While the ribs and cauliflower are cooking, scatter hazelnuts on a rimmed baking sheet and toast on bottom rack, tossing once, until golden brown, 30-35 minutes. Let cool, then rub together in a kitchen towel to remove skins, if using skin-on nuts. Coarsely chop and set aside.
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6
Increase oven temperature to 450u00b0F. Uncover ribs and return to oven, placing on top rack. Roast, basting with fat from skillet every couple of minutes, until a deep brown crust develops, 12-15 minutes.
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7
Toss celery, celery leaves, parsley, and reserved hazelnuts in a medium bowl to combine. Drizzle with oil and vinegar and toss to coat; season celery salad with salt and pepper.
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8
Serve short ribs over cauliflower puree with celery salad on top.
