In a large container, combine cucumbers, onion and salt. Let stand for 3 hours, stirring occasionally.
In a bowl, combine the remaining ingredients; let stand for 2-3 hours, stirring often.
Drain and rinse the cucumber mixture; add sugar mixture and stir well. Pack into 1-pt. freezer containers, leaving 1-in. headspace. Cover and freeze for up to 6 weeks. Thaw before serving.
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