I make Plum wine every year using Aoume (unripe plum) which my pearents send me after they picked.
・Aoume(unripe plum) 1〜1.2kg ・white liqueur(35°/35 % alcohol by volume) 1800ml ・Koori satou(rock sugar) 400〜1000g ※you can use honey or zarame(crystal sugar) intead of rock sugar
1.wash unripe plum and then wipe it with a cloth 2.score the surface of all plums for avoiding to make wrinkles 3.put plums and rock sugar in a wide-mouthed bottle and then pour liqueur 4.after min. 3 months, you can drink ※you'd better to take plums out 6 months later