STEP 3

Put the purée in the frying pan and add 250ml boiling water, swirl everything around to pick up every last bit of flavour, and tip the lot into the slow cooker. Add the herbs, stock cube and some pepper. Don’t add salt until the casserole is cooked as the stock can be quite salty. Cook on high for 4 hrs or on low for 8 hrs, then serve or leave to cool and freeze.