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Soups and Stews

Potato Leek Soup with Lemon

October 26, 2020 by Alexandra Daum
Vegan potato leek soup with lemon for a lightened up version of the classic comfort food dish. This simple meal is perfect for cozy autumn and winter meals or with the first spring vegetables.
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Two bowls of soup with the pot.

This kind of soup is usually made with heavy cream and then pureed to make a very lush, smooth soup – much like this potato cauliflower soup. I like it a little chunkier, so this is my cream free, vegan potato leek soup! I’ve lightened things up with some lemon but it’s still a potato soup, and definitely comfort food.

It’s ultra traditional all over Europe and the UK; the first time I made potato leek soup I was about eight years old and had seen it in one of my mom’s cookbooks. I wasn’t really clear on what leeks were (I don’t think they were so commonly found in that region at the time) and my aunt recommended onions instead. This is before you could just instantly search everything online, of course. Not my best soup!

I go semi-blended, with just enough to make a slightly richer, thicker broth that still has pieces of potato and leek throughout. You can choose not to blend at all or go for a fully pureed soup – it’s up to you.

Woman's hands holding a bowl of soup.

Scroll to the bottom of the post or click “skip to recipe” above to see the recipe card with full ingredient measurements and instructions.

Ingredients

  • Olive oil
  • A small onion
  • Potatoes (see tips)
  • Leeks
  • Garlic
  • Sea salt
  • Black pepper
  • Vegetable broth (or water, see tips)
  • Cooked white beans
  • Lemon
  • Greens (optional)
Potato leek soup ingredients.

Method

Heat the oil over medium heat in a large pot. Add the onion and sauté for a couple of minutes, then add the potatoes, leeks, and garlic. Cook for another 3-4 minutes. Stir in the salt, pepper, thyme, and vegetable broth.

Bring the soup to a low boil (covered) then add the beans. Reduce the heat and simmer, covered, for 25-30 minutes, or until the potatoes are fork soft.

Remove the soup from the heat and add the lemon juice. Taste for seasoning and add salt as needed (before pureeing!). Blend the soup with an immersion blender to the degree that you’d like. Serve immediately.

This soup freezes very well – since we’re only two people, I usually freeze half in jars for later. Simply thaw overnight in the refrigerator, and then reheat in a pot.

A pot of soup before blending.

Tips and Notes

The type of potato you use will have some impact on the texture of the soup, but it isn’t hugely important. If where you’re getting them from notes if they’re floury or waxy, go for the floury potatoes. You want them to fall apart a bit when cooking.

I get loads of messages every time I share a soup recipe and say it can be made with water. As long as you season correctly (just add enough salt) you certainly can make just about any soup with regular tap water. Of course a good vegetable broth makes it a bit easier, but just season your food and you’ll be fine.

It’s particularly important to season this soup well – and any vegan potato soup. Potatoes absorb loads of salt and you’ll likely need a slightly heavier hand than usual to make up for it. Note that I always write less salt in the ingredients list than I end up using, as it should be to your personal taste.

Two bowls of soup with spoons.

Substitutions

If you don’t have white beans on hand (either cooked or canned) you can sub chickpeas or leave them out altogether. They add some extra protein and make the soup more filling – and they’re almost invisible in the finished dish, if you have picky eaters – but aren’t a mandatory element.

Here are some substitutes for thyme if you’re not a fan or don’t have it. I don’t recommend leaving it out altogether with no replacement.

This is a really simple, minimal soup, and there aren’t very many substitutions I can offer. You might notice that chard is pictured in the ingredient image, but not in the final soup. It’s optional and I decided against including it this time. You can use spinach, chard, kale, whatever you have on hand, if you decide to include greens.

Two bowls of soup with the pot.

More Cozy Soups

Vegetarian Borscht
Creamy Cauliflower Potato Soup
Butternut Squash, Lentil, and Rice Soup
Chickpea Noodle Soup
Immunity Soup

A bowl of soup with a large spoon.

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Yield: 4

Potato Leek Soup with Lemon

Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
4.88 from 8 votes

Ingredients

Metric – American
  • 2 teaspoons olive oil
  • 1 small onion diced
  • 400 grams about 4 medium potatoes, cut into 2 cm (1 inches) pieces
  • 2 medium leeks white only, cut into 1 cm (1/2 inches) slices
  • 2 cloves garlic minced
  • 1 tablespoon thyme
  • 1 teaspoon salt to taste
  • ½ teaspoon pepper
  • ¼ teaspoon cayenne pepper
  • 1 litre water 4 cups
  • 250 grams cooked or canned white beans, drained and rinsed
  • Zest and juice of a lemon

Instructions

  • Heat the oil in a large pot over medium heat. Sauté the onions for about two minutes, or until softened and slightly browned.
    2 teaspoons olive oil, 1 small onion
  • Add the potatoes, leeks, and garlic, and cook for another 3-4 minutes, stirring frequently to prevent sticking*. Add the thyme, salt, and pepper, followed by the vegetable broth.
    400 grams about 4 medium potatoes, cut into 2 cm (1 inches) pieces, 2 medium leeks, 2 cloves garlic, 1 tablespoon thyme, 1 teaspoon salt, 1/2 teaspoon pepper, 1/4 teaspoon cayenne pepper, 1 litre water
  • Increase the heat to high and bring the soup to a rolling boil, covered. Add the beans.
    250 grams cooked or canned white beans, drained and rinsed
  • Reduce the heat and simmer for 20-25 minutes, or until the potatoes can be easily pierced with a fork.
  • Remove from the heat and add the lemon juice and zest. Taste and season as needed, then puree with an immersion blender to the degree you’d like (or don’t blend at all).
    Zest and juice of a lemon
  • Serve immediately. Leftovers keep well in a sealed container in the refrigerator for a couple of days and can be frozen.

Video

Notes

* Don’t worry if the vegetables are sticking slightly to the bottom of the pot, as long as they’re not burning. Any small pieces will lift once the broth is added and while the soup is cooking.

Nutrition

Serving: 1g Calories: 225kcal Carbohydrates: 43g Protein: 9g Fat: 3g Saturated Fat: 0.4g Polyunsaturated Fat: 0.5g Monounsaturated Fat: 2g Sodium: 623mg Potassium: 912mg Fiber: 8g Sugar: 4g Vitamin A: 884IU Vitamin C: 31mg Calcium: 119mg Iron: 4mg
© Alexandra Daum
Course: Soups and Stews
Cuisine: European
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Comments

  1. Kia M. says

    June 21, 2021 at 7:23 pm

    5 stars
    My husband and I LOVE this recipe. It’s got wonderful flavors, and then POP! the lemon surprises you at the end with a kick. I live in FL and I like some soup recipes for our rainy season, but nothing to heavy… this is perfect!!!

    Reply
  2. Kathie says

    April 12, 2020 at 4:13 am

    Delicious! I used to make a puréed leek, potato, and lemon soup, but gradually I have gotten tired of puréed soups. This had all the flavors , and I appreciated the textures. I ate it 3x today with a crackly, seedy bread I made, and it was so good!

    Reply
  3. Alexandra Daum says

    February 12, 2018 at 6:36 pm

    Thank you 🙂 I think we can all be a little hard on ourselves and expect a lot! I know the recipe is the important thing though.

    Reply
  4. Chien-Hui says

    February 9, 2018 at 7:23 pm

    Your photos are always lovely; you don't have to be so hard on yourself. Hope you won't refrain from posting recipe because you are not satisfied with pics 🙁 would be such a pity to deprive your readers of your wonderful ideas

    Reply

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