Slow-cooker Beef Stew

1. Heat the olive oil in a pan over a medium heat.

2. Add the onion and celery and gently fry for 5 mins. 

3. Add the carrots, bay and thyme, and fry for 2 mins.

4. Now add the purée and Worcestershire sauce, followed by 600ml boiling water, stir and tip everything into a slow cooker. 

5. Add the stock pots and stir, then season with pepper. 

6. Clean out the frying pan and fry the beef in a few sprays of one cal spray until it is well browned, then into the slow cooker. 

7. Cook on low for 8-10 hrs, or on high for 4 hrs.

8. Stir in the parsley and season to taste. 

9. Serve with mash, if you like. Leave to cool before freezing.