INGREDIENTS
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1 Tbs. fennel seeds
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2 tsp. coriander seeds
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2 tsp. cumin seeds
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1 tsp. celery seeds
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1 tsp. caraway seeds
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Kosher salt and coarsely ground black pepper
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1 4-bone (9- to 10-lb.) beef standing rib roast, lightly trimmed of exterior fat and top 1/2 inch frenched, if desired
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2-1/4 cups (18 oz.) brown ale, such as Newcastle
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2-1/4 cups lower-salt beef broth
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3 Tbs. Dijon mustard
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2 oz. (4 Tbs.) cold unsalted butter, cut into 4 pieces
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Flaky sea salt, for finishing