If you have a mandolin then put it on the second thinnest setting and slice the cucumber. Arrange on a plate. If you are doing this in advance then stop at this point and place the plate in the refrigerator until ready to serve.
When ready to serve, drizzle lemon juice, oil, salt and chili powder on cucumber slices. If you do this ahead of time the cucumber will get soggy.
Recipe from Theres Always Pizza at TheresAlwaysPizza.com