For the currant orange jelly, boil 1000 g of currant with 250 ml of water, stirring constantly, and strain the juice through a cloth.
Squeeze the oranges. Mix 750 ml of currant juice with the freshly squeezed orange juice and the jelling sugar and boil for 4 minutes while stirring until bubbling. Skim off the foam that forms on the surface and immediately pour into the hot rinsed glasses.
Turn the currant-orange jelly upside down and allow to cool.