Scotch Marmalade

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4 oranges 2 lemons 2 grapefruit 2 1/2 quarts water 7 pounds granulated sugar Boil fruit whole in the water for 1/2 hour. Cool and remove pulp. Put skins and all through a grinder, then measure back into the pot and add water to make 3 quarts. Boil for 45 minutes. Add sugar. Boil again for 15 minutes. Put into sterilized jars and seal with paraffin. Serve with shortbread, scones or oat cakes.