Rock Salt Encrusted Prime Rib

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Ingredients

20 pounds standing rib roast (weight with bones, top fat trimmed)
2 ounces onion soup mix
2 tablespoons ground black pepper (freshly)
8 cups rock salt
8 cups all-purpose flour
2 tablespoons dried rosemary (crushed)
2 cups water (or more if needed)
4 ounces prepared horseradish (for serving)
3 ounces au jus gravy mix (for serving)
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