If we have a huge crop of plums, or apples, we let them to ferment in barrels and leaven will go to local distillery where they produce hard drink for us.
I still have a 20 liters bottle full of fine hard drink made from mix of fermented plums and pears from last distillation.
For example from 200 liters of fermented plums you can obtain up to 20 liters of hard drink with 52% alcohol if the sugar is high.