Potage Cultivateur French Vegetable Soup with Potatoes
Potage cultivateur is a French vegetable soup with small pieces of leek, carrot, turnip and potato in a clear, savoury broth. This version includes fennel, golden beet and kohlrabi, with butter-softened vegetables and fresh chervil at the end. Keep the simmer gentle: the vegetables should be tender enough for a spoon while still recognizable in the bowl.
This recipe is based on my YouTube video, with a few adjustments since publication to clarify the quantities, seasoning and cooking cues. The vegetables stay in pieces, so there is no blender to wash and no cream to add. Make a generous pot for cool-weather lunches, or use the same method year-round when you have fresh root vegetables to work through.
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A vegetable soup that keeps its texture
I make it this way because sweating the vegetables in butter softens the leek and onion before the broth goes in. There should be no browned crust on the bottom of the pot. That would push the flavour toward roasted vegetables and change the character of this soup.
The other important choice is adding the potatoes later. Carrot, beet and kohlrabi need a head start, while potato pieces can start breaking up if they spend the whole cooking time bubbling in the broth. A little potato starch gives the liquid body without turning it into a purée.
For a completely smooth bowl, try the blended vegetable soup with leeks and potatoes. The carrot potage Crécy also has a different texture and a more focused carrot flavour. This soup is about the mixture of vegetables, each still visible on the spoon.
Ingredients and the broth that ties them together
Use the trimmed, peeled weights in the recipe card. Vegetable sizes vary too much for “one leek” or “two turnips” to give a consistent batch. A large leek can have a lot of tough green leaves; those trimmings should not be counted toward the soup weight.
Leeks and onion form the base. Fennel adds a mild anise note that becomes gentler as it cooks. Carrots provide sweetness, and a mix of orange, yellow and purple carrots matches the video. Purple carrots may tint the liquid slightly, so use orange carrots if you prefer a lighter broth.
White turnip and peeled kohlrabi bring a different kind of vegetable flavour. Remove the woody outer layer of the kohlrabi, including the fibrous material just underneath. Golden beet gives colour and sweetness without the strong red tint of a red beet. The potatoes go in separately near the end.
Use unsalted or low-sodium chicken stock. A homemade vegetable stock makes a vegetarian version with the same cooking sequence. If you use homemade chicken bouillon cubes, dilute them to a normal drinking-strength broth first. Concentrated stock should not go straight into this pot.
Fresh chervil is the finishing herb. Its delicate leaves belong in the soup after cooking, when their aroma will not be lost to a long simmer. There is no need to add garlic, tomato paste, cream or flour to the base recipe.
How to make potage cultivateur
1. Wash and cut the vegetables
Split the leeks lengthwise and rinse between the layers, especially where the white section becomes green. Drain well. Peel the roots and potatoes, trim the fennel, and remove the tough kohlrabi skin. Slice the vegetables into small, thin pieces, roughly 1/8 to 1/4 inch thick. Triangles, quarter-rounds and short strips are all suitable.
What matters most is thickness. A thick beet cube will still be firm when a thin leek strip is already soft. Keep the potatoes separate and cut them shortly before they go into the soup. In the video, I do not rinse the cut potatoes; their surface starch helps give the broth a little body.
2. Soften the leek, onion and fennel
Melt the butter over medium heat in a heavy pot of at least 7 quarts. Add the leek, onion and fennel. Cook for about 5 minutes, stirring regularly. The onion should begin to look translucent, the leek should relax, and the bottom of the pot should remain pale.
If the vegetables catch, lower the heat and add a tablespoon or two of water. The mistake to avoid is treating this like a hard sauté. You want a soft hiss, not vegetables frying until their edges turn brown.
3. Add the remaining roots
Add the carrots, white turnip, golden beet and kohlrabi. Stir to coat them in the butter and cook for another 5 minutes without browning. Turn the vegetables over from the bottom so that the whole mixture heats evenly. The roots do not need to be fully cooked at this stage.
4. Add stock and give the roots a head start
Pour in the stock and bring it just to a boil. Lower the heat to a gentle simmer and cook for 15 minutes with the lid partly on. Stir occasionally. If your stock is already salted, wait until the end before adding any salt.
Taste the broth before seasoning it. With unsalted stock, begin with a small amount of salt rather than adding the video’s full quantity automatically. The vegetables release flavour as they cook, and evaporation also changes the seasoning.
5. Cook the potatoes and finish with chervil
Add the potatoes and simmer gently for another 15 to 20 minutes. A potato piece should yield to the tip of a knife without falling apart, and the thickest beet or kohlrabi piece should have no hard centre. If the roots need longer, continue cooking and check again after a few minutes.
The finished soup should have plenty of vegetables with broth flowing freely between them. Add a little hot stock or water if it has reduced too much. Season with salt and pepper to taste, turn off the heat, and stir in the chopped chervil.
Ladle into warm bowls, distributing the vegetables and broth evenly. There is no blending or straining at the end.
What to serve with it
Serve a smaller bowl as a starter, or a generous bowl with homemade white bread for lunch. Soft focaccia with a crisp crust is another good way to enjoy the broth. For crunch, add homemade garlic croutons at the table so they do not soften in the pot.
This is a vegetable-rich soup with potatoes and a modest amount of butter per serving. It is not a particularly high-protein meal by itself. A lentil and egg salad alongside makes lunch more substantial without changing the soup.
Substitutions
Use regular orange carrots in place of the mixed-colour carrots, keeping the same weight. If golden beets are unavailable, replace their portion with extra carrot or white turnip. Red beet works differently because it colours the whole broth, so it is not the closest replacement for the appearance shown here.
Replace unavailable kohlrabi with the same trimmed weight of white turnip. The flavour will change slightly. For a vegan version, use vegetable stock and 3 tablespoons of olive oil instead of butter. Flat-leaf parsley can replace chervil, though it will not have the same delicate anise-like aroma. Keep substitutions within the same total vegetable weight rather than adding extra vegetables on top.
FAQ
Should I blend this soup?
No. The thin vegetable pieces are the point of this version. If you want a smooth potato-based soup instead, potage Parmentier is a more suitable choice.
Why are my root vegetables still firm?
They may be cut too thickly, or the soup may not have maintained a simmer. Check beet and kohlrabi as well as potato before serving. The stated time is a guide; tenderness is the final test.
Can I make a smaller batch?
Yes. Halve every ingredient and use a smaller pot. Keep the same vegetable thickness and cooking sequence. The simmering time will stay similar because the pieces still need to cook through.
Can I prepare it ahead?
Yes. Cool promptly in shallow containers and refrigerate for up to 3 days. Reheat gently, adding a little water or stock as needed. Potatoes can become softer after freezing, so refrigerating gives a result closer to the freshly cooked soup.
More soups with vegetables
For vegetables with pasta and beans, make minestrone. For a thicker bowl built around legumes, try lentil soup with vegetables. Leek soup with cheesy croutons is another option when you want the leek to be the main flavour.
Potage Cultivateur French Vegetable Soup with Potatoes
Ingredients
- 12 oz trimmed leeks washed
- 9 oz peeled onion
- 10 1/2 oz trimmed fennel bulb
- 14 oz peeled carrots
- 9 oz peeled white turnip
- 9 oz peeled golden beet
- 7 oz peeled kohlrabi
- 1 lb 2 oz peeled waxy potatoes
- 3 1/2 tablespoons unsalted butter
- 10 1/2 cups unsalted or low-sodium chicken stock
- 2 tablespoons chopped fresh chervil
- Fine salt to taste
- 1/2 teaspoon ground black pepper plus more to taste
Instructions
- Wash, trim and peel the vegetables. Cut into small, thin pieces about 1/8 to 1/4 inch thick. Keep potatoes separate.
- Melt butter over medium heat in a heavy pot of at least 7 quarts. Sweat leek, onion and fennel for 5 minutes without browning.
- Add carrots, white turnip, golden beet and kohlrabi. Cook for 5 minutes, stirring, without browning.
- Add stock, bring just to a boil, then simmer gently for 15 minutes with the lid partly on. Salt lightly only if the stock is unsalted.
- Add potatoes and simmer for 15 to 20 minutes, until potatoes, beet and kohlrabi are tender. Add hot stock or water if needed.
- Adjust salt and pepper. Turn off heat, stir in chervil and serve without blending.
