Plum Liquor.
I bought a bottle when I was in Japan a couple a years ago, and it was so good I had to try and make it myself.
I made this bottle last fall, but it has to mature for almost a year before you can drink it.
Fill a jar with already washed plums, add a lot of sugar. I added 2 dl/2 cups in a 1l jar. Then add vodka till the jar is full. You have to turn the jar once every day for 15 days to allow the sugar to dissolve. I tasted it after a couple of weeks to see if it was sweet enough.
I made two versions, one with honey and one with half a lime. Must say the one with lime was my favorite.
Have a glass while watching Café Lumière/Kôhî jikô.