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Feb 22, 2026

Parsnip and Leek Soup with Cumin and Mustard Seeds

This parsnip and leek soup gets its wonderful flavor from cumin and mustard seeds that you toast in hot oil with garlic. You stir it into this soup just before serving. 

Parsnip and Leek Soup with Cumin and Mustard Seeds in a bowl.


I really loved the flavor the fried garlic, mustard seeds, and cumin seeds added at the end. If you make this soup, don't skip this step. The technique for adding the spices is an Indian term called "tarka." The oil draws out the flavor but leaves the whole spices intact to add texture to the dish. 

Believe it or not, I had never actually had parsnips before, so I figured now would be a good time! They're in season and my grocery store actually has them. They are a fairly neglected root vegetable (like the rutabaga or celery root) and worth being rediscovered. 

Parsnips resemble pale white carrots but they are fatter at more rustic looking. Their flavor is sweet and nutty, and they are often roasted, mashed, pureed, and added to soups and stews. If you decide to buy some, keep them in the fridge for up to three weeks, similar to carrots. You can eat them raw, but cooking brings out their flavor. 

Leeks, parsnips, potatoes, and other root vegetables.


Ingredients in This Parsnip and Leek Soup:

Parsnips: Peeled, cored, and diced. To core the parsnip, run your knife down the center of quarter pieces of a parsnip to remove this woody core. Remove as much as you can. 

Onions: Yellow onions, diced. 

Leeks: White and light green parts, rinsed and sliced. 

Yukon Gold Potatoes: You can also use the small Dutch potatoes. Peeled and diced. 

Low Salt Chicken Broth. 

Spices and Seasonings: Salt, pepper, ground turmeric, cayenne powder, garlic, cumin seeds, and black mustard seeds. 

Unsalted Butter and Extra Virgin Olive Oil. 

Parsnip and Leek Soup with Cumin and Mustard Seeds Ingredients.


To Make This Parsnip Soup:

First, cook the onions and some salt and pepper in the butter in a heavy duty pot. Add the broth, leeks, parsnips, and potatoes and simmer for about 5 minutes. 

Next, add the spices and simmer for about 20 minutes. 

After that, puree the mixture with a blender or an immersion blender. Add more broth if the mixture is too thick. 

Finally, right before serving, heat the olive oil in a small skillet and and cook the garlic, cumin seeds, and mustard seeds for about a minute. Stir the mixture into the soup. Season with more salt and pepper to taste. 

I also added some fried pancetta I had on hand to each bowl and it was pretty tasty.

Parsnip and Leek Soup with Turmeric in a bowl.


The turmeric adds a lot of yellow color to this soup. In fact, be pretty careful to not spill on your clothes or carpet! 

Equipment You May Need:

To blend this soup, you will need either a blender or an immersion blender. I have both and decided to use my immersion blender. You'll have less dishes to wash and less mess. Alternatively, a good blender will ensure that your soup is super smooth. It's up to you! 

By the way, leftovers are even better the next day. 

Parsnip and Leek Soup with Cumin and Mustard Seeds in a blue bowl.

I topped each bowlful with a spoonful of cooked pancetta. Delicious. 

Root Vegetables:

This week, the Sunday Funday group is sharing recipes with root vegetables. This recipe features parsnips, but actually has six root vegetables, including onions, potatoes, garlic, turmeric, and leeks (which are a root-like vegetable related to onions, garlic, and shallots). 


Parsnip and Leek Soup in blue bowls.




Parsnip and Leek Soup with Cumin and Mustard Seeds

Parsnip and Leek Soup with Cumin and Mustard Seeds
Yield: 8 servings
Author: Karen Kerr
Prep time: 30 MinCook time: 1 HourTotal time: 1 H & 30 M

This parsnip and leek soup gets a wonderful flavor from cumin and mustard seeds that you toast in hot oil with garlic. You stir it in just before serving. 

Ingredients

  • 2 tablespoons unsalted butter
  • 1 large yellow onion, medium dice
  • Kosher salt and freshly ground black pepper to taste
  • 6 cups reduced sodium chicken broth
  • 2 medium leeks, white and light green parts, trimmed, sliced lengthwise, washed, and sliced into 1/2 inch slices
  • 1 pound parsnips, peeled, cored, and diced
  • 1 pound Yukon Gold potatoes, peeled and diced
  • 2 teaspoons ground turmeric
  • 1/2 teaspoon cayenne powder
  • 2 tablespoons extra virgin olive oil
  • 4 medium cloves garlic, peeled and chopped
  • 2 teaspoons cumin seeds
  • 2 teaspoons black mustard seeds
  • 4 ounces pancetta, cooked in a saute pan (optional)

Instructions

  1. Heat the butter in a 6 to 8 quart heavy duty pot or Dutch oven over medium heat. Add the onions, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Cook, stirring occasionally, for about 8 to 10 minutes. The onion should be soft and lightly browned.
  2. Add the broth, leeks, parsnips, and potatoes and raise the heat to medium. Simmer for five minutes and then reduce the heat to low. Add the turmeric and cayenne powder and stir and then simmer for about 20 minutes.
  3. Blend the soup with either a blender (in batches) or an immersion blender. Add more broth if the soup is too thick.
  4. Right before serving, heat the olive oil in a small skillet and cook the garlic, cumin, and mustard seeds for about 30 to 60 seconds. Stir the mixture into the soup.
  5. Season the soup with more salt and pepper to taste. Add about a tablespoon of optional sauteed pancetta. 

Nutrition Facts

Calories

202

Fat (grams)

8 g

Sat. Fat (grams)

3 g

Carbs (grams)

28 g

Fiber (grams)

5 g

Net carbs

23 g

Sugar (grams)

5 g

Protein (grams)

6 g

Cholesterol (grams)

8 mg
parsnips,
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This recipe has been inspired by a recipe from the now discontinued Fine Cooking Magazine from January 2010. I'm so glad I saved my old copies, which is not something I usually do. The publisher sold the magazine and the new buyer shut it down after a few months and deleted the online versions of the recipes. 

The magazine article features recipes using parsnips, including one for pie, pancakes, a mash, risotto, and lamb stew. The author is David Tanis, an advocate for using fresh, in season, and local produce. 

Would you like to comment?

  1. Don't know why, I've not cooked with parsnips. This soup recipe is the right one to begin with. Like the tarka for the soup. Like the variety of roots in your recipe.

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  2. I feel like leeks and parsnips are kind of veggie underdogs! I like roasted parsnips in a medley roast, and I absolutely love leeks in soup... and bread. YUM.

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    Replies
    1. I remember buying leeks and the checkout person asked me what they were! I love them and I'm enjoying getting to know parsnips.

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  3. Of late, I have started experimenting with parsnips, So, this is a great recipe for me to try. I have perpatual leeks in the garden ready to be harvested as well. Looks like it wll be on my happy meal list soon.

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  4. Your post brought some nostalgic memories. Until a few years ago, I used to do tadka in every soup. I think a few of my blog posts still have. Somehow, down the line, I stopped doing so. The soup looks quite creamy with tempered cumin. very flavourful.

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    Replies
    1. It's my first time trying the method and I loved it! Thanks for sharing your memories.

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  5. I first came across parsnips when we moved to Sydney as newlyweds (almost 40 years ago!) and there they were, looking very much like beige carrots, in my local supermarket. Since those were in the days way before the internet, I bought some to try. I roasted them like potatoes. Love at first bite! That is one beautiful thick soup, Karen! Wish I had a bowl on this weirdly chilly day in Texas.

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    Replies
    1. Thanks so much Stacy. I wish I'd tried parsnips much sooner!

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  6. I love a root vegetable soup! So perfect for winter!

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