INGREDIENTS
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a 7- to 8-pound trimmed prime beef rib roast* (sometimes called standing rib roast; 3 or 4 ribs)
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1 tablespoon vegetable oil
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2 heads garlic
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3 tablespoons chopped fresh thyme leaves
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1/4 cup minced shallot
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2 tablespoons red-wine vinegar
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1 1/2 cups dry red wine
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1 bay leaf
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3 cups veal or beef demiglace** or 4 cups beef broth
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1 1/2 tablespoons unsalted butter, softened
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1 1/2 tablespoons all-purpose flour if using beef broth