One easy way to use kohlrabi is in salads. Peel & slice to add a nice crunch to your green salads. Or peel and grate and prepare using your favorite cole slaw recipe. Gratin: We have adapted our favorite gratin recipes to include kohlrabi. Try kohlrabi as the sole vegetable in the gratin or along with potato. Peel, chop, and steam the kohlrabi and then add to the gratin for baking.