Shepherds Pie

Name: Shepherd's Pie
Ingredients: 4 large russet potatoes, peeled and quartered; 10 whole garlic cloves, peeled; 1/2 cup sour cream; 1/4 to 1/2 cup beef broth; 4 tablespoons butter, softened; 1/2 teaspoon salt; 1/2 teaspoon freshly ground black pepper; Nonstick cooking spray; 4 slices bacon, cut into thin strips; 1 tablespoon vegetable oil; 2 medium onions, chopped; 1/2 teaspoon salt, plus 1/2 teaspoon; 1 teaspoon sugar; 1 pound ground beef; 2 to 3 medium carrots, roughly chopped, (about 1 cup); 3/4 cups frozen peas, thawed; 2 garlic cloves, minced; 2 tablespoons tomato paste; 1 tablespoon all-purpose flour; 1 (12-ounce) bottle light or dark beer; 1/2 cup beef broth; 1 teaspoon finely minced fresh rosemary leaves; 1/2 cup grated Swiss or Cheddar; 2 tablespoons chopped fresh parsley leaves