I'm not overly fond of the red currants, black currant is awesome though. 3 cups is what... 7 dl? Not very much, so a 1 gallon batch?
Ten pounds of currants
Five pounds of raspberries
Fifteen pounds of honey
That's a 5 gallon recipe, just scale it down.
But straight up honey, water, yeast and then red currants in secondary could work.