Ingredient:

• 1 tablespoon olive oil
• 1 tablespoon butter
• 2 pounds lean ground lamb
• 1 onion, diced
• ⅓ cup all-purpose flour
• 3 cloves garlic, minced
• 1 tablespoon ketchup
• 2 teaspoons minced fresh rosemary
• 1 teaspoon paprika
• ⅛ teaspoon ground cinnamon
• salt and ground black pepper to taste
• 2 ½ cups water, or as needed
• 1 (12 ounce) package frozen peas and carrots, thawed
• 2 ½ pounds Yukon Gold potatoes, peeled and halved
• ¼ pound Irish cheese (such as Dubliner), shredded
• ¼ cup cream cheese
• 1 tablespoon butter
• 1 pinch ground cayenne pepper
• 1 large egg yolk
• 2 tablespoons milk