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Set the oven temperature to a very low level, such as130 f (about 55℃), the lower the temperature, the longer the time. Set it to 140 F (about 60℃) in the demonstration.
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Bake intermittently for about 6 hours. I finished it in four times. Generally, the oven takes about 30 minutes, which takes about 2 hours. At the same time, observe the shrinkage of grapes at any time. This is more than two hours later.
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four
Pinch the pulp with your fingers and the juice stays. You have to keep baking until there is no juice.
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