The withered berries affected by the Botrytis cinerea fungus are manually harvested one by one while the bunches are still on the vines. After the berries are carefully selected and poured into vats, Eszencia is the free-run juice of aszú berries without pressing. This is the richest natural wine in the world. Due to its extreme sugar content, it can hardly ferment, so its alcohol level is only 4-5% or even less.