syrup and cordial? maybe that's enough. 1 bucket of red currants and 2 gallons of black currant juice.
https://recipeswap.org/fun/wp-content/uploads/Finer_Kitchens/AngAk/photo-2-20.jpg~original
https://recipeswap.org/fun/wp-content/uploads/Finer_Kitchens/AngAk/photo-2-20.jpg~original