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Wash the sloes and pick off any stems, then pat them dry with a tea towel or paper towel. Prick the sloes, or freeze them overnight so that their skins split. Add the sloes to a sterilised bottle or jar till it’s just under half full.
Top up the bottle or jar with gin and add the sugar. Seal the jar or bottle and leave for three months or longer, shaking the jar periodically to ensure that the sugar dissolves.
Before drinking, strain the gin from the sloes through a sieve or muslin and re-bottle.