Curried Vegetarian Shepherds Pie

Name: Curried Vegetarian Shepherd's Pie
Ingredients: 2 pounds russet potatoes, peeled and quartered; Kosher salt; 2 bay leaves; 2 carrots, chopped; 3 sprigs thyme; 1 small rutabaga, peeled and chopped; 1 medium turnip, peeled and chopped; 2 leeks (white and light green parts only), sliced 1/2 inch thick, rinsed well; 6 tablespoons unsalted butter; 8 ounces button mushrooms, quartered; 3 tablespoons all-purpose flour; 1 teaspoon ground coriander; 1/4 teaspoon freshly grated nutmeg; 1 1/2 cups half-and-half; 1 cup frozen peas; Grated zest and juice of 1/2 lemon; 1/4 cup chopped fresh parsley; 2 teaspoons curry powder