I know that it's traditionally eaten with turkey, but cranberry sauce goes equally well with goose or suckling pig, as well as cold pies. It will keep for a week or so in the fridge in a sealed container.
The juice and grated zest of 3 oranges
200g sugar, plus a little extra if required
Put the cranberries in a pan with the orange juice and zest and the sugar. Heat on a low heat, stirring every so often until the sugar has melted, then continue cooking for about 15 minutes until the cranberries have softened.
Taste the cranberry sauce for sweetness; add more sugar if necessary. Leave to cool; store in the fridge until required and heat gently in a pan, or just serve at room temperature.