Shepherd's Pie

INGREDIENTS

• 1 1/2 pounds ground round
• 1 cup chopped onion
• 1/2 (8-oz.) package fresh mushrooms, sliced
• 1 garlic clove, minced
• 1 cup frozen peas, thawed
• 4 teaspoons beef bouillon granules
• 1/2 teaspoon salt
• 1/2 teaspoon dried thyme
• 1/4 teaspoon freshly ground pepper
• 1 tablespoon all-purpose flour
• 1 (14 1/2-oz.) can stewed tomatoes
• 1 bay leaf
• 2 tablespoons red wine vinegar
• Cheese-and-Carrot Mashed Potatoes