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Combine cucumbers and salt in a large, shallow bowl, cover and chill 1½ hours. Rinse cucumbers in colander under cold water. Drain well, and return cucumbers to bowl. Add onion and toss with the cucumbers.
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Combine the granulated sugar, white vinegar, apple cider vinegar, brown sugar, mustard seeds, celery seeds and ground turmeric in a medium saucepan; bring to a simmer over medium heat, stirring until the sugar dissolves.
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Pour the hot vinegar mixture over cucumber mixture; let stand at room temperature 1 hour. Cover and refrigerate 24 hours.