Kartoffelsuppe (German Potato Soup with Leek and Celeriac)

Kartoffelsuppe is German potato soup at its most comforting: thick, smooth and savoury, with potatoes giving body and leek and celeriac adding gentle sweetness and earthy depth. In this version, the vegetables simmer with bay and vegetable stock before being blended into a velvety base and finished with double cream. Crisp bacon on top brings smoky saltiness and a welcome contrast to the soft, creamy soup. It is the kind of practical, warming dish that works well as a simple dinner, especially with bread alongside, and can be adjusted easily with extra stock for a looser texture.
Cuisine style German home-style cooking
Flavor profile Creamy • Savoury • Gently earthy
Techniques Rendering bacon • Sweating vegetables • Simmering • Blending
Key equipment Large pot • Immersion blender
Time commitment Under 1 hour
Cooking style One-pot cooking • Meal prep friendly

Why this recipe works

  • Layered savoury base: Cooking the onion, leek and celeriac in the rendered bacon fat gives the soup depth before the stock is added.
  • Velvety finish: Tender potatoes and celeriac blend into a naturally thick soup, while double cream rounds out the texture.
  • Simple comfort: A smooth potato base with a crisp, smoky topping makes the soup warming, filling and easy to serve as a main meal.

Get the most out of this recipe

Ingredient notes

  • Clean the leek well: Leeks often hold grit between the layers, so rinse them thoroughly after slicing before adding them to the pot.
  • Use a creamy potato: Yukon Gold potatoes suit this soup because they blend smoothly while still giving the soup body.
  • Celeriac adds depth: Celeriac brings a savoury, celery-like earthiness; cauliflower will make the soup milder and slightly sweeter.

Texture tips

  • For a smoother soup: Blend only once the potatoes and celeriac are very tender, as undercooked pieces can leave the texture coarse.
  • Adjust the thickness: If the soup feels too thick after blending, loosen it gradually with a little more vegetable stock until it ladles easily.
  • Warm the cream gently: After adding the double cream, keep the soup over a low heat and avoid boiling to preserve a smooth finish.

Make-ahead tips

  • Freeze without the topping: Freeze the blended soup without the bacon for the best texture, then add freshly crisped bacon when serving.
  • Reheat gently: Defrost overnight in the fridge, then reheat on the hob until piping hot, stirring often to keep the texture even.
  • Keep bacon crisp: Store the bacon topping separately from the soup so it stays crisp rather than softening in the liquid.

Authenticity notes

  • German home-style soup: Kartoffelsuppe is commonly made as a practical home-style soup, using potatoes and aromatic vegetables for a filling, economical meal.
  • Smoky toppings vary: Crisp bacon is a common savoury finish, while some versions use smoked sausage for a heartier bowl.

Equipment you'll need

Ingredients
Instructions
Print
  1. Cut the bacon into small pieces. Set a large pot over a medium heat and cook the bacon for 6 to 8 minutes, stirring, until the fat renders and the bacon is golden. Scoop out the bacon with a slotted spoon and set aside, leaving the fat in the pot.
  2. Add the onion to the pot and cook for 4 minutes until softened. Add the leek and cook for 3 minutes, stirring, until it starts to soften. Stir in the celeriac and cook for 2 minutes to coat in the bacon fat.
  3. Add the potatoes, bay leaves, vegetable stock and black pepper. Bring to the boil, then reduce to a gentle simmer and cook for 18 to 22 minutes, until the potatoes and celeriac are very tender. Remove and discard the bay leaves.
  4. Blend the soup until completely smooth, then return it to a low heat. Stir in the double cream and warm for 2 to 3 minutes until steaming, but do not let it boil. Taste and adjust with a little more black pepper if you like.

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Recipe notes

Tips

  • For a cleaner flavour, rinse the leek well after slicing to remove any grit trapped between the layers.
  • If you prefer a slightly lighter texture, blend thoroughly, then thin with a splash more vegetable stock until it ladles easily.
  • For vulnerable groups, ensure the soup is reheated until piping hot and the bacon is cooked until properly crisp.

Substitutions

  • Replace double cream with crème fraîche for a gentle tang, and warm it through over a low heat without boiling.
  • Replace bacon with smoked turkey for a similar smoky topping with less fat.
  • Replace celeriac with cauliflower for a milder, slightly sweeter soup.

Storage

  • Refrigerate up to 3 days
  • Cool the soup quickly, then refrigerate in a sealed container. Freeze the blended soup without the bacon topping for best texture; defrost overnight in the fridge and reheat gently on the hob until piping hot, then top with freshly crisped bacon.

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Kartoffelsuppe (German Potato Soup with Leek and Celeriac)
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Recipe overview

  • Servings: 4 servings
  • Total time: 50min (20min active)
  • Difficulty: Easy
  • Cuisine: German
  • Allergens:
    Celery Milk
Beginner friendly Freezer friendly Kid friendly

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