Shepherd's Pie

Name: Shepherd's Pie
Prep time: 45 min
Cook time: 45 min
Total time: 1 h 30 min
Cuisine: British, European
Ingredients: 1 1/2 pounds russet potatoes; 1/4 cup half-and-half; 2 ounces unsalted butter; 3/4 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 1 egg yolk; 2 tablespoons canola oil; 1 cup chopped onion; 2 carrots, peeled and diced small; 2 cloves garlic, minced; 1 1/2 pounds ground lamb; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 2 tablespoons all-purpose flour; 2 teaspoons tomato paste; 1 cup chicken broth; 1 teaspoon Worcestershire sauce; 2 teaspoons freshly chopped rosemary leaves; 1 teaspoon freshly chopped thyme leaves; 1/2 cup fresh or frozen corn kernels; 1/2 cup fresh or frozen English peas