Place cucumber slices in a colander sitting over a bowl, sprinkle with salt and toss well. Let sit for 1 hour refrigerated. Toss the cukes a few times while they drain as well. While cucumber slices are draining, prepare marinade below.
Combine vinegar, water, sugar and red pepper in a small saucepan; bring to a boil. Reduce heat, cook until reduced to a 1/3 cup (about 10 minutes). If for some reason you boil for too long, just add a little water until you have 1/3 C. Remove reduction from heat and add onion. Let mixture cool to room temp.
When cucumbers are done resting, pat them dry with a few paper towels and then combine with the vinegar reduction. This can be served immediately, but for best results refrigerate until well chilled.
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