Mom's marinated cucumbers recipe marinates sliced cucumbers in sugar, water, vinegar, celery seeds, and onion, then they're chilled for an hour.
Peel cucumbers, slice wafer-thin, sprinkle with salt. Set aside for 30 minutes; squeeze cucumbers to release moisture.
Combine sugar, vinegar, onion, water, and celery seeds in a bowl; add cucumbers and stir until evenly coated.
Cover and refrigerate for 1 hour.