Ingredients:

• Salt
• 1/4 cup unsalted butter
• 2 cups sliced shallots or thinly sliced onions
• 2 cups diced celery
• 1/4 cup all-purpose flour
• 12 ounces egg noodles
• 1/3 cup dry vermouth or dry white wine
• 1 1/2 cups milk
• 1/4 cup cream or sour cream
• 2 cups chicken or turkey stock
• 2 teaspoons dry tarragon
• 6 ounces grated Gruyere cheese
• 2 tablespoons whole-grain mustard
• 3 cups coarsely chopped cooked turkey
• 1/2 teaspoon freshly ground black pepper
• 2 tablespoons lemon juice
• 1/2 cup panko breadcrumbs
• 1 tablespoon melted butter
• Freshly chopped parsley, for garnish, optional