Here is a recipe I can't wait to try, courtesy one of my favorite cooking blogs, Our Best Bites:
Sweet and Spicy Cucumber Slices
1-1/2 lbs cucumber (about 3 medium), peeled, halved lengthwise & thinly sliced
2 tsp kosher salt
1/2 c rice vinegar, seasoned or regular
1/2 c water
3 Tbs sugar*
1/4 tsp red pepper flakes
2 Tbs minced red onion
Place cucumber slices in a colander sitting over a bowl, sprinkle with salt and toss well. Let sit for 1 hour refrigerated. It doesn't hurt to 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, combine with the vinegar reduction. This can be served immediately, but for best results refrigerate until well chilled.