• Heat the oven to 325°F. Grate 1 teaspoon zest from the lemon.
• Heat the olive oil in a roasting pan over medium-high heat. Add the beef and cook until well browned on both sides. Remove the beef from the pan. Pour off all but 1 tablespoon pan drippings.
• Reduce the heat to medium. Add the garlic to the pan and cook until golden, stirring occasionally. Add the vinegar to the pan and cook and stir for 1 minute, scraping up the browned bits from the bottom of the pan. Stir in the stock, thyme and rosemary sprigs. Reduce the heat to low. Cook for 5 minutes. Season with the black pepper.
• Return the beef to the pan. Spoon the stock mixture over the beef. Cover the pan.
• Bake for 2 1/2 hours or until the beef is fork-tender. Baste the beef with the pan juices every 30 minutes. Remove the beef from the pan, cover and keep warm.
• Strain the pan drippings through a sieve into a medium bowl, reserving the garlic and discarding the thyme and rosemary sprigs. Spoon off any fat.
• Place about half the garlic cloves and about 1 cup pan drippings into a food processor or blender. Cover and process until the mixture is smooth.
• Heat the garlic mixture, remaining garlic cloves, remaining pan drippings, chopped rosemary, minced garlic and lemon zest in a 10-inch skillet over medium-high heat to a boil. Cook and stir until the gravy is thickened. Serve the gravy with the beef.
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