Wash the cockles, removing any small crabs and other undesirable tenants from the shells. Soak them in at least four fresh lots of cold water and drain in a colander.
Bring the champagne and the chopped shallot to the boil in a large saucepan. Throw in the cockles and cover the pan. Shake from time to time to make sure that none of the cockles are left too long
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