Kohlrabi and Baby Leek Soup
My husband and I were at the Farmers Market. He wanted kohlrabi; I wanted baby leeks. I thought I’d make a soup with both. That’s essentially how this recipe was created. And while the recipe is written for kohlrabi and baby leeks, there are some alternate ingredients included below. When visiting friends in Seattle and wanting to make it for a dinner party, kohlrabi and baby leeks weren’t available or in season. So, I used what was at hand locally and in my friends’ pantry. I know you aren’t supposed to experiment when cooking for others but I made a rutabaga, which I’ve never cooked but is from the same brassica family, and leek soup. Both soups were equally delicious and didn’t disappoint.
The flavor profile using kohlrabi versus rutabaga is mildly different – hints of sweet, peppery broccoli stem versus bitter turnip. And, the kohlrabi will create a slightly thicker soup. Pick your desired combination and enjoy!
- 5 Tbs unsalted butter, separated, plus more for flavor if needed
- 4 Tbs olive oil
- 1 bunch baby leeks* (about 5-6) chopped; use entire leek
- 1 large onion, diced
- 3 small to medium kohlrabi,** greens and stems removed, cut into ½-inch chunks
- 1 medium Yukon potato, peeled and cut into ½-inch chunks
- 5 cups stock (chicken or vegetable)
- Aleppo pepper
- 1 bay leaf
- 3-4 sprigs of thyme, plus extra for flavor or garnish
- Salt and pepper
- Pecorino Romano cheese,*** grated, for garnish
Heat 4 Tbs of butter and the olive oil in a large pot on medium heat, melting the butter until it is slightly foaming. Add baby leeks and onion and cook until the onions become slightly translucent, stirring often, about 10 minutes. Add thyme sprigs and 3 generous pinches of Aleppo pepper. Reduce heat slightly and cook until leeks or onions just start to caramelize.
Add kohlrabi, potato and 1 tsp salt. Return heat to medium and cook about 5-7 minutes.
Add stock and bay leaf. Bring to boil. Reduce heat and simmer for 25 to 30 minutes, or until kohlrabi and potato are tender.
Remove pot from heat and discard bay leaf and thyme stems. Purée mixture with a hand blender until smooth and creamy. Add stock to thin or cook longer to reach your desired consistency. Taste and add chopped thyme, Aleppo pepper, salt and/or pepper to adjust seasonings as needed. Butter can also be added if desired (which I did for the rutabaga variation.)
Return pot to heat and cook on low until ready to serve. Garnish with Pecorino Romano and thyme. Add salt and pepper to taste.
Serves 3-4 dinner portions or 6-8 side portions.
Alternative Ingredients (interchangeable for one or all of the above):
* 2 leeks, white and light green portions only, chopped
**1 large rutabaga, peeled and cut into ½-inch chunks
*** Parmigiano-Reggiano, grated