When all you crave on a bleak, lazy or stressful day is something crunchy and cheeky, yet deeply satisfying, make this salad. Kohlrabi, either the whitish-green or purple-skinned variety, is not often available at regular supermarkets, but most local and ethnic grocers stock them. Cucumbers are notorious for drawing water, so leave it to drain for as long as possible and only dress the salad just before serving.