Corned Beef Soup - Oryana

Ingredients

• 1 tablespoon butter or olive oil
• 1 cup onion, chopped
• 2 stalks celery, chopped
• 1 large carrot, sliced
• 1 bay leaf
• 6 cups chicken broth
• 2 teaspoons yellow mustard
• 3 cups cabbage, chopped
• 1 large russet potato, cubed
• 2 cups corned beef, chopped
• Salt and freshly ground black pepper, to taste