How is the intoxicating effect removed from grapes?

Question:
(Are the grapes) cooked first?

Answer:
They are cooked first until the causes of their strength are removed.
Q: Or are they cooked after the period has passed?
A: It appears to be after the fermentation, and after pressing whatever is pressed.
Q: Meaning they are left for two days and then cooked?
A: No, it is not obligatory. It appears their intention is that this cooking removes the causes that result in intoxication.