Kohlrabi is a vegetable that recalls its cabbage relatives in flavor and texture, but not appearance. The stem tastes of both cabbage and turnip, and has a broccolilike texture when cooked. The leaves are delicate, like spinach, but are often trimmed away. Avoid kohlrabi bulbs that are larger than 3 inches (7.5 cm) or have cracks. Refrigerate in a plastic bag for up to 1 week.