Shepherds Pie

Name: Shepherds Pie
Ingredients: 2 lb. (1 kg.) boneless lamb shoulder, cut into 1-inch (2.5-cm) chunks; Kosher salt and freshly ground pepper; 2 Tbs. olive oil; 8 Tbs. (1 stick) (4 oz./125 g.) unsalted butter; 1 large yellow onion, chopped; 3 carrots, chopped; 3 celery stalks, chopped; 2 small garlic cloves, minced; 1/3 cup (2 oz./60 g.) all-purpose flour; 3 1/3 cups (27 fl. oz./840 ml.) beef broth; 2/3 cup (5 fl. oz./160 ml.) dry white wine; 2 tsp. minced fresh rosemary; 3 lb. (1.5 kg.) russet potatoes, peeled and cut into chunks; About 1/3 cup (3 fl. oz./80 ml.) heavy cream, warmed; 1 cup (5 oz./155 g.) fresh or thawed frozen peas