Leave them for approximately 30–60 seconds.
Watch the skins carefully.
You may notice fine cracks beginning to appear.
This is the sign you’re looking for.
Remove the grapes promptly.
Don’t boil them until they become soft or start falling apart.
Small grapes may need less time than large ones.
The exact timing depends on the variety and skin thickness.
Step 7: Transfer Immediately to the Cold Bath
Using a mesh strainer or slotted spoon, remove the grapes from the boiling water.
Transfer them directly into the prepared cold citric acid
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