Raspberry Jam
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Ingredients
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To every lb. of raspberries allow 1 lb. of sugar, 1/4 pint of red-currant juice.

Method
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Let the fruit for this preserve be gathered in fine weather, and used as soon after it is picked as possible. Take off the stalks, put the raspberries into a preserving-pan, break them well with a wooden spoon, and let them boil for 1/4 hour, keeping them well stirred. Then add the currant-juice and sugar, and boil again for 1/2 hour. Skim the jam well after the sugar is added, or the preserve will not be clear. The addition of the currant juice is a very great improvement to this preserve, as it gives it a piquant taste, which the flavour of the raspberries seems to require.

Source: Mrs Beeton's Book of Household Management (1861)
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