I can usually only get a very small amount of them, but I often mix them with redcurrants to get a very nice, beautifully red jelly.
Pick stone bramble berries. It takes a considerable amount of berries to get a good amount of juice, but I can't tell you exactly what amount of berries will yield what amount of juice.
Flush the berries with cold water and put in a cooking pot. Bring to the boil on low and cook gently until the berries burst and release their juice. Pour the berries and juice into a cheesecloth strainer and strain away the juice. The cheesecloth may be squeezed to extract more juice.
Measure the juice and put it in a cooking pot and bring to the boil. Remove from the heat and add 1 kg of sugar for every litre of juice (if it’s less than a litre, then add 100 grams of sugar for each 100 ml of juice). Stir to dissolve the sugar. The…