Peel the kohlrabi and cut in half. Slice each half thinly (1/8 inch) with a mandolin. Remove the fibrous end of the asparagus* and slice asparagus thinly with a potato peeler. Remove stems and seeds from peppers and julienne thinly. Remove each end of the squash and cut the squash into 2-inch lengths. Julienne the squashes skin side down on the mandolin until you reach the seeded center. (The centers may be saved for vegetable stock). Trim the radishes and slice thinly, lengthwise on the mandolin. Place all vegetables in a stainless steel bowl, cover and refrigerate until needed.