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–+ servings
A bowl of creamy leek and potato soup topped with golden croutons and sautéed leeks, set on a wooden surface. The soup is smooth and light in color, with a drizzle of oil and scattered crispy toppings.

Leek And Potato Soup (Slow Cooker recipe)

Lauren
My Caramelised Leek and Potato Soup in the slow cooker is all the taste with half the hassle!
5 from 4 votes
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Prep Time 10 minutes
Slow Cook Time 10 hours
Total Time 10 hours 10 minutes
Course Lunch
Cuisine American, British
Servings 8
Calories 388 kcal

Ingredients
  

  • 120 g salted butter⁣
  • 1 onion large
  • 500 g leeks dark green parts removed then chopped ⁣
  • 1 teaspoon sugar
  • 3 cloves garlic
  • 800 g potatoes peeled & chopped⁣
  • 750 ml chicken bone broth or chicken stock
  • 750 ml whole milk
  • 150 ml double cream heavy cream
  • 1 ½ teaspoon salt

Instructions
 

  • Slow Cooker Method for Caramelising Leeks - place 120 g salted butter⁣, 500 g leeks, 1 onion, 3 cloves garlic & 1 teaspoon sugar in your slow cooker - cook on High for 4-6 hours or Low for 8-10 hours - ideally stir a handful of times throughout (minimum 4 hours required)
  • Hob Method for Caramelising Leeks - add butter, leeks, onion, garlic and sugar to large pot and cook on medium heat (with the lid on) for approx 20-25 minutes (until leeks are soft). Then remove the lid, increase the heat and stir continuously for 5 minutes whilst the leeks caramelise (30 minutes required)
  • Add 800 g potatoes, 750 ml chicken bone broth(or chicken stock) and 750 ml whole milk - cook on High for 4 hours or Low for 8 hours.
  • Pour in 150 ml double cream then blitz up in food processor/blender or use a hand blender until its totally smooth (See Notes)
  • Finally, season with 1 ½ teaspoon salt (use less or more to taste but this is what suited me) and serve

Notes

Blending the soup: be careful when blending the soup as over-blending potato can burst the starch molecules and make the soup gloopy and gummy. Two things happen:
  • Starch Release: blenders, especially powerful ones like Ninja, Vitamix or immersion blenders, rapidly break apart potato cells, releasing excessive amounts of starch.
  • Gluey Texture: this excess starch gels into a sticky, glue-like substance when heated, making the soup thick and gloppy rather than smooth and velvety. 
So be very careful with blending, but if this happens, add more liquid (milk, stock etc.) to loosen it off a little. 

Nutrition

Calories: 388kcalCarbohydrates: 37gProtein: 9gFat: 24gSaturated Fat: 14gPolyunsaturated Fat: 1gMonounsaturated Fat: 6gTrans Fat: 0.5gCholesterol: 68mgSodium: 736mgPotassium: 825mgFiber: 4gSugar: 11gVitamin A: 1856IUVitamin C: 29mgCalcium: 192mgIron: 2mg
Keyword easy leek and potato soup, leek and potato soup, leek and potato soup in slow cooker, slow cooker leek and potato soup
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