Sterilize the canning jars in boiling water. Drain and allow to dry thoroughly.
Wash and drain the onions. Peel the onions and remove the roots at the bottom. With the point of a paring knife cut a cross mark in the bottom of each onion so it will absorb vinegar. Leave onion tops intact.
In a large saucepan, bring salt and vinegar to a boil over high
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