Use a vegetable peeler to pare 4 lengthwise strips from each cucumber. Cut the cucumbers in half lengthwise, scoop out seeds with a small spoon and cut into thin diagonal slices.Advertisement
Combine vinegar, sugar, salt and water in a medium bowl, stirring until sugar has dissolved. Add cucumbers, onions, bell pepper, shallot and crushed red pepper. Cover with plastic wrap and refrigerate for at least 30 minutes.
Drain vinegar from the vegetables and serve.
Make Ahead Tip: Prepare through Step 2 and refrigerate for up to 3 hours.