West Virginia Shepherd's Pie

4 medium potatoes, peeled and cubed
2 medium parsnips, peeled and cubed
3/4 cup evaporated milk
2 tablespoons butter
1 teaspoon salt
1 teaspoon pepper, divided
2 eggs
1 teaspoon dried mint
1 teaspoon dried rosemary, crushed
1 teaspoon Worcestershire sauce
1/4 teaspoon ground allspice
1 pound ground lamb
1/2 cup chopped onion
1/4 cup chopped celery
1 tablespoon olive oil
1/2 cup fresh peas

Place potatoes and parsnips in a large saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or until tender. Drain; mash potato mixture. Add the milk, butter, salt and 1/2 teaspoon pepper; mash until combined.
In a large bowl, combine the eggs, mint, rosemary, Worcestershire sauce, allspice and remaining pepper. Crumble lamb over mixture and mix well.
In a large skillet, cook onion and celery in oil over medium heat until tender. Add lamb mixture; cook and stir until lamb is no longer pink; drain.
Place lamb mixture in a greased 11-in. x 7-in. baking dish; sprinkle with peas. Spread potato mixture over peas. Bake, uncovered, at 375° for 30-35 minutes or until golden brown. Yield: 6 servings.