I just do 3lbs of red currants to 3lbs of sugar. Heat the water and sugar to boiling, add the red currants (I remove the stems but you don't have to), let them defrost to just below boiling then take off the heat and leave to cool. Once cool add your yeast, cover with a towel, and stir daily for a week. Strain into a demijohn, and leave for 6ish weeks then try it and see if its done. For a scientist my homebrewing is very unscientific!
Dans