Corned Beef Shepherd'S Pie

Ingredients

• FILLING
• 1 cup cold strained leftover corned beef broth
• 1/2 teaspoon spicy brown mustard
• 1/4 teaspoon prepared horseradish
• 1/4 teaspoon ground coriander
• salt & fresh ground white pepper
• 2 1/2 tablespoons cornstarch
• 2 cups leftover cooked corned beef, cut to 1-inch dice
• 1 cup leftover cooked cabbage, cut into bite-sized pieces
• 1 cup leftover cooked carrot, cut into bite-sized pieces
• 1 fresh small onion, cut into bite-sized pieces
• 1 tablespoon minced fresh parsley, divided
• 2 tablespoons salted real butter
• TOPPING (Dot with grated cold butter before garnish if desired)
• 3 -4 cups prepared seasoned stiff mashed potatoes
• 1 beaten egg yolk
• GARNISH
• remaining minced parsley
• French-fried onions (French's)