Wash the oranges thoroughly. Cut off the outer peel, and cut the peel into thin strips. Divide the oranges in two and juice them. Measure the juice and make up to 8 dl with water. Mix the juice, peel and ginger in a pan and boil for 5 minutes. Add the jam sugar and boil for 3 minutes, stirring constantly. Skim off any scum. Pour the marmalade into warm, sterilised jars. Seal. Store in a cool place.
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