Method
1. Heat sunflower oil in a large cast iron skillet on high heat
2. Add steak and fry until browned
3. Transfer meat to slow cooker bowl
4. Add onion to the large cast iron skillet
5. Fry until light golden - 5 min, high heat
6. Stir all purpose flour into the large cast iron skillet
7. Add beef stock to the large cast iron skillet gradually
8. Add worcestershire sauce, tomato paste, English mustard and rosemary
9. Season with salt & pepper to taste
10. Add rutabaga, carrot and parsnip to the slow cooker bowl
11. Mix and pour sauce from the pan to the slow cooker bowl
12. Arrange the potato slices on top so that they are overlapping in the stock
13. Add fresh rosemary and salt & pepper to the slow cooker bowl and cover
14. Cook in slow cooker until tender - 7 hr, high heat
15. Serve warm