Put the potato, onion, carrots and celery in a microwavable container with 4 tablespoons of water. Microwave for 4 minutes.

Meanwhile spray a wide based lidded pan with Spray2Cook and when the Spray2Cook is bubbling add the beef and stir and fry until browned all over.

Add the microwaved vegetables and continue to cook with the lid on for 5 minutes. Add the stock (hot). Add the purée, thyme pepper, and bay leaves. Blend the cornstarch with a little water (adding slowly) and then add the blended cornstarch to the pan as it just starts to bubble.

Turn the lidded pan down to a simmer or transfer to a slow cooker set at high until it again bubbles then turn down the slow cooker as needed - either way cook at a "bubbling" simmer for 4 hours.

After 2 hours 45 minutes microwave the mirepoix vegetables with 4 tablespoons of the stock from the slow cooker for 4 minutes. Remove from the microwave, shake and add 2 tablespoons of water. Microwave for a further 4 minutes. Again remove from the microwave, shake and add 2 tablespoons of water. Microwave for a further 4 minutes.Blend the mirepoix vegetables with a hand blender to a paste and add together with the peas to the simmering casserole.

Continue to simmer for the final hour of cooking time. Remove the bay leaves. Serve and enjoy.