Roasted Kohlrabi and Radishes

Published on June 11, 2018

Purple kohlrabi is now in season at Whole Foods! If you don’t yet know about this vegetable, you are in for a treat. I’ve been watching for them ever since I bought them last time and discovered how special and very tasty this vegetable is. According to the produce man the season will last from one week to a month. He says they sell out fast because of their growing popularity.

Kohlrabi, ‘German turnip,’ is a biennial vegetable. It is a member of the cabbage family along with broccoli, cauliflower, kale, collard greens, and Brussels sprouts. The bulbous part is actually the swollen stem of the plant. Uncooked it tastes like a sweeter milder version of broccoli stems, and just like broccoli stems you need to peel off the tough outer skin because it’s very fibrous. The inside of the ‘bulb’ is denser than its broccoli counterpart so when it’s cooked the texture can almost remind you of white potatoes and you can make a puree with it like you can with cauliflower. Like rutabaga, kohlrabi can be very woody. The smaller ‘bulbs’ are better.

For foodies around the world this alien-looking but beautiful vegetable of many varieties, both pale green and purple, is valued for both its many ways of being cooked — steamed, sautéed, stir fried, roasted, boiled and turned into veggie burgers, stuffed and baked, thinly sliced and made into chips, cut up for salads or slaws or to make ‘french fries,’ spiraled into ‘noodles,’ and put into soups and stews — and for its nutrition. Kohlrabi’s nutrients include copper, potassium, manganese, iron, and calcium, and vitamin C, B-complex vitamins, vitamin A, and vitamin K. It’s high in dietary fiber and antioxidant compounds.

Some notes on roasting vegetables…
Roasted vegetables are a wonderful sweet and savory taste experience. After trying many different combinations of vegetables, I’ve found that the trick to mastering roasting is for each vegetable to be cut to the right size so they will be tender at the same time and not having to keep them all cooking because one is not tender yet. After some experimenting, I found that daikon radishes (white and purple and probably green too), parsnips, carrots and sweet potatoes all consistently cook fine when cut no more than an inch by a half and inch. Beets, rutabagas, kohlrabi and turnips are the ones that need to be cut no more than a half an inch. If it all goes right, the onions are slightly caramelized and all the vegetables come out sweet with only a hint of the naturally bitter undertone left in the vegetables that have them.

Doing vegetables this way is really fun and goes along side lamb or beef roasts or burgers, barbecued steak, roasted chicken or turkey and scrambled eggs — just about everything. Ideally, they need to be eaten right away.

I’ll be posting a series of combinations of roasted vegetables and will be putting this introduction with each of them hoping it will help everyone become successful at these really delicious and pretty side dishes.

Roasted Kohlrabi and Radishes

Roasted Kohlrabi and Radishes


The amounts of each of the cut up vegetables will vary depending on the size you buy. A total of 6 cups of vegetables, plus the onions, works well for an 18 by 13 sheet pan. Don’t overcrowd of the vegetables will steam instead of caramelizing.


Line a sheet pan with foil or parchment paper. Place kohlrabi and radishes in one bowl and onion in another bowl. Sprinkle 1/2 tablespoon of olive oil over the onions and mix with your hands to spread the oil over all the pieces. Spread the onions on the prepared cookie sheet and roast in a 425 degree oven for 8 – 10 ten minutes or until the edges start to brown. In the meantime measure the remaining oil into a small bowl and add the garlic and rosemary and mix. Pour mixture over the kohlrabi and radishes and mix with your fingers to coat all the pieces. Spread the kohlrabi and radishes amoung the onions turning the radishes cut side down. Sprinkle with salt. Roast for an additional 30 – 40 minutes or until lightly browned. Test the kohlrabi by removing one with a fork and tasting it to see if it’s tender and sweet. This is high heat so keep an eye on them so they don’t burn.

For an additional side dish, kohlrabi greens are similar to collard greens and kale and can be cooked. Cut the leaves off either side of the stem and place them in a steamer basket. When tender, top with chopped garlic sautéed in butter and sprinkle with salt. Kohlrabi greens are very mild tasting but fibrous and can take longer to cook than collard green and kale.

ingredients for Roasted Kohlrabi and Radishes
trimming kohlrabi