Even the Romans were in on it: Passito, a sweet wine made from air-dried or sun-dried grapes. To achieve this, the grapes are spread across straw mats or wooden racks after harvest, spending several weeks or even up to a month there until shrivelling to a raisin-like state. This causes the water to evaporate from the grapes and concentrates the sugar content. The result is golden, sun-sweetened wines – mouth-watering stuff!
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