If your slow cooker has a sauté function, melt the butter directly in the pot. Or, do this in a frying pan over a medium heat. Cook the onion, leeks and bay leaf with a pinch each of salt and black pepper for 10-15 mins, stirring occasionally until all the veg is soft. If you’ve used a frying pan, transfer the softened veg and bay leaf to the slow cooker.
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