Air Fryer Beef Stew and Dumplings

For the Beef Stew:

• 1 lb stewing beef, cut into chunks
• 1 tablespoon olive oil
• 1 small onion, chopped
• 2 carrots, chopped
• 2 celery stalks, chopped
• 2 potatoes, diced
• 2 cups beef broth
• 1 tablespoon tomato paste
• 1 teaspoon Worcestershire sauce
• 1 teaspoon dried thyme
• 1 teaspoon dried rosemary
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1 tablespoon cornstarch (mixed with 2 tablespoons water, for thickening)

For the Dumplings:

• 1 cup self-raising flour
• 1/4 cup suet or butter, grated
• 1/2 teaspoon salt
• 2–3 tablespoons cold water