There’s nothing quite like a big bowl of homemade soup on a cold day, and this slow cooker leek, fennel, and potato soup is one of my all-time favorites. It’s creamy, earthy, and packed with flavor thanks to the sweet leeks and tender potatoes, plus a bit of zing from fresh herbs on top.
Serve it up with some crusty bread, and it’s honestly the perfect cozy meal. It’s even better if you make it the day before, as the flavors get a chance to settle and blend. Each spoonful just tastes like pure comfort.
Jump to Recipe Print RecipeRecipe Ingredients
For the Soup:
- 1/4 cup (60 ml) extra virgin olive oil
- 3 leeks (white part only), washed and thinly sliced
- 2 garlic cloves, coarsely chopped
- 1 fennel bulb, halved and thinly sliced
- 1 lb 12 oz (800 g) potatoes, cut into 1½-inch (4 cm) pieces
- 6 cups (1.5 liters) good-quality vegetable stock
- 1/3 cup (50 g) raw cashews
- 2 teaspoons fennel seeds, toasted and coarsely ground
- Sea salt and freshly ground black pepper, to taste
- Crusty bread, to serve
For the Herb Salsa:
- 1 large handful of flat-leaf parsley, coarsely chopped
- 3–4 tablespoons coarsely chopped mint
- 1 tablespoon finely snipped chives
- Finely grated zest of 1 lemon
- 1/3 cup (80 ml) extra virgin olive oil, plus extra for drizzling
How To Make Leek, Fennel and Potato Soup With Herb Salsa
- Prepare the Ingredients: Pour the olive oil into a large slow cooker, then add the sliced leeks, garlic, fennel, potato pieces, and cashews. Season generously with sea salt, freshly ground black pepper, and ground fennel seeds.
- Start Cooking: Set the slow cooker to high and cook for 5 hours, ensuring all the vegetables become very tender and the flavors meld together.
- Prepare the Herb Salsa: When there are 10 minutes left for the soup to finish cooking, combine the parsley, mint, chives, lemon zest, and olive oil in a bowl. Stir well until the salsa ingredients are fully mixed.
- Blend the Soup: Once the cooking time is up, use a stick blender, food processor, or blender to purée the soup in batches until it reaches a smooth, creamy consistency.
- Adjust Seasoning: Taste the soup and adjust the salt and pepper if needed, making sure the flavors are balanced and the seasoning is just right.
- Serve and Garnish: Ladle the soup into bowls, top with a generous spoonful of herb salsa, and drizzle with a little extra olive oil if desired. Serve with warm crusty bread on the side for dipping.
Recipe Tips
- Add a splash of coconut milk near the end of cooking to make the soup even creamier, adding a subtle richness that complements the fennel and leeks.
- For an extra layer of flavor, lightly caramelize the leeks and fennel in the olive oil before adding them to the slow cooker for a slightly sweet, deeper taste.
- If you prefer a heartier texture, blend only half the soup, leaving some chunks of potato and fennel to add variety in each spoonful.
- Swap out potatoes with sweet potatoes for a touch of natural sweetness, which pairs wonderfully with the herb salsa and adds extra creaminess.
Recipe FAQs and Variations
Can I Use a Different Herb for the Salsa?
Yes, basil or cilantro can be used instead of parsley or mint. Both herbs add a unique twist and pair well with the creamy soup base.
What’s the Best Way to Store Leftover Soup?
Store leftovers in an airtight container in the fridge for up to three days. Reheat gently on the stovetop, stirring occasionally to maintain the soup’s smooth texture.
Can I Freeze This Soup?
Absolutely! Let the soup cool completely before transferring it to freezer-safe containers. It will keep in the freezer for up to two months.
Can I Make This Soup Without a Slow Cooker?
Yes, cook it on the stovetop in a large pot over low heat for about 1.5 hours, or until the vegetables are tender.
Check out More Recipes:
- Sweet Potato and Carrot Soup With Cheesy Agnolotti
- Slow Cooker Spiced Carrot and Cumin Soup
- Slow Cooker Thai-style Pumpkin Soup
Leek, Fennel and Potato Soup With Herb Salsa
Course: SoupCuisine: MediterraneanDifficulty: Easy6
servings15
minutes5
hours210
kcalThere’s nothing quite like a big bowl of homemade soup on a cold day, and this slow cooker leek, fennel, and potato soup is one of my all-time favorites. It’s creamy, earthy, and packed with flavor thanks to the sweet leeks and tender potatoes, plus a bit of zing from fresh herbs on top.
Ingredients
- For the Soup:
1/4 cup (60 ml) extra virgin olive oil
3 leeks (white part only), washed and thinly sliced
2 garlic cloves, coarsely chopped
1 fennel bulb, halved and thinly sliced
1 lb 12 oz (800 g) potatoes, cut into 1½-inch (4 cm) pieces
6 cups (1.5 liters) good-quality vegetable stock
1/3 cup (50 g) raw cashews
2 teaspoons fennel seeds, toasted and coarsely ground
Sea salt and freshly ground black pepper, to taste
Crusty bread, to serve
- For the Herb Salsa:
1 large handful of flat-leaf parsley, coarsely chopped
3–4 tablespoons coarsely chopped mint
1 tablespoon finely snipped chives
Finely grated zest of 1 lemon
1/3 cup (80 ml) extra virgin olive oil, plus extra for drizzling
Directions
- Prepare the Ingredients: Pour the olive oil into a large slow cooker, then add the sliced leeks, garlic, fennel, potato pieces, and cashews. Season generously with sea salt, freshly ground black pepper, and ground fennel seeds.
- Start Cooking: Set the slow cooker to high and cook for 5 hours, ensuring all the vegetables become very tender and the flavors meld together.
- Prepare the Herb Salsa: When there are 10 minutes left for the soup to finish cooking, combine the parsley, mint, chives, lemon zest, and olive oil in a bowl. Stir well until the salsa ingredients are fully mixed.
- Blend the Soup: Once the cooking time is up, use a stick blender, food processor, or blender to purée the soup in batches until it reaches a smooth, creamy consistency.
- Adjust Seasoning: Taste the soup and adjust the salt and pepper if needed, making sure the flavors are balanced and the seasoning is just right.
- Serve and Garnish: Ladle the soup into bowls, top with a generous spoonful of herb salsa, and drizzle with a little extra olive oil if desired. Serve with warm crusty bread on the side for dipping.
Nutrition Facts
6 servings per container
- Amount Per ServingCalories210
- % Daily Value *
- Total Fat
10g
16%
- Saturated Fat 2g 10%
- Cholesterol 0mg 0%
- Sodium 530mg 23%
- Total Carbohydrate
35g
12%
- Dietary Fiber 6g 24%
- Sugars 4g
- Protein 6g 12%
* The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
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