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Prepare the mussels. Scrub them to remove any barnacles and pull away the beard, then discard any that are damaged or won’t close when tapped.
Melt the butter in a large pan and cook the onions for 3-4 mins, then add the garlic. Pour the cider over and sprinkle in the sage, then bring to the boil. Turn the heat down to a simmer and cook until reduced by half.
Add the mussels, cover and cook over a medium heat (shaking the pan occasionally) for 3-4 mins until they have opened. Lift the mussels into a bowl and keep warm.
Bubble the cooking liquid in the pan for 2 mins, then carefully blend in the crème fraîche. Heat through and pour over the mussels to serve.