Wash the grapefruit thoroughly. Cut into thin segments, and the thin segments into thin slices. Thaw the strawberries and cut into small pieces. Combine the grapefruit and strawberry pieces with the jam sugar in a saucepan and boil for 10-15 minutes. Carefully skim off any foam. Pour into warm, sterilised jars. Seal. Store in a cool, dark place.
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