Make juice from currants! Of course, you can also take something that has been bought, but you should make sure that it is unsweetened!
Put the currant juice in a saucepan with the wine. First mix the contents of the Gelfix bag with 2 tablespoons of sugar, then mix with the juice and wine mixture, bring to a boil over high heat. As soon as everything boils bubbly while stirring, add the remaining sugar and bring to the boil again. Let it simmer for at least 3 minutes while stirring constantly, remove from the hob, skim if necessary and pour into prepared glasses immediately! Close the jars and turn them upside down for a few minutes!