Ingredients: 1/2 cup balsamic vinegar,1/2 cup (1/4 lb.) plus 1 tablespoon butter or margarine,2 cups Cabernet Sauvignon or other dry red wine,3 cups fat-skimmed low-sodium beef broth,1/4 cup chopped fresh mint leaves,2 tablespoons fresh thyme leaves or 1 tablespoon dried thyme,30 cloves garlic, peeled,1/2 cup plus 1/2 tablespoon extra-virgin olive oil,1 tablespoon chopped Italian parsley,About 1/4 teaspoon pepper,1 3/4 pounds Yukon Gold or russet potatoes, peeled and cut into 1 1/2-inch chunks,About 1/2 teaspoon salt,1/2 cup chopped shallots (about 4 oz.),1 fat-trimmed lamb loin, boned, rolled, and tied (about 1 lb. total; see notes),1/2 cup whipping cream
Instructions: