Soupe au Pistou (Vegetable Soup with Basil Sauce)

In Provence, soupe au pistou is the kind of vegetable soup that relies on freshness rather than heaviness: a broth of tender beans, potatoes and summer vegetables finished with a vivid basil sauce. The soup itself is deliberately simple, allowing courgettes, tomatoes, cannellini beans and new potatoes to give body and sweetness as they simmer. Its defining feature is the pistou — basil, garlic, olive oil and cheese pounded into a thick, aromatic paste — stirred into each bowl just before eating so the herbs stay bright. Served with extra Parmesan at the table, it makes a generous, comforting dinner with a distinctly sunny, savoury finish.
Cuisine style Provençal French home cooking
Flavor profile Herby • Savoury • Garlic-rich
Techniques Gentle simmering • Pounding pistou
Key equipment Large pot • Mortar and pestle
Cooking style One-pot cooking • Make-ahead friendly • Freezer-friendly
Time commitment Under 1 hour

Why this recipe works

  • Built-in depth: Potatoes, beans, tomatoes and stock simmer together to create a rounded vegetable broth without needing a long cooking time.
  • Fresh pistou finish: Adding the basil sauce at the table preserves its aroma and gives each bowl a vivid, garlicky lift.
  • Practical to store: The soup base keeps and freezes well when the pistou is stored separately, making it easy to reheat without losing freshness.

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Authenticity notes

  • Provençal style: Soupe au pistou is closely associated with Provence and is known for pairing a simple vegetable soup with a basil-garlic sauce.
  • Pistou at the table: Passing the pistou separately lets each person stir in as much as they like while keeping the basil flavour bright.

Ingredient notes

  • Use fresh basil: Dried basil will not give the same fragrant, green finish; fresh leaves are central to the character of the pistou.
  • Choose waxy potatoes: New potatoes hold their shape well during simmering, keeping the broth clearer and the texture more defined.
  • Olive oil matters: A good extra virgin olive oil gives the pistou a fuller, more rounded flavour because it is not cooked into the soup.

Make-ahead tips

  • Keep the pistou separate: Refrigerate the soup and pistou in separate containers, then stir the pistou into hot soup just before serving.
  • Freeze the soup base: Freeze the vegetable soup without the pistou, then add freshly made or chilled pistou after reheating.
  • Reheat gently: Warm the soup on the hob until piping hot, using a gentle heat so the potatoes and courgettes do not break down too much.

Common mistakes

  • Boiling too hard: A vigorous boil can make the potatoes crumble and cloud the broth; keep the soup at a steady, gentle simmer.
  • Adding courgettes too early: Courgettes cook faster than potatoes, so adding them later helps them stay tender rather than collapsing.
  • Seasoning too soon: Stock and Parmesan both add salt, so taste and adjust the soup only once the beans, tomatoes and cheese are in play.

Equipment you'll need

Ingredients

Soup

Pistou and to serve

Instructions
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  1. Warm the olive oil in a large pot over a medium heat. Finely chop 2 garlic cloves and cook for 30 seconds until fragrant, without letting it colour.
  2. Halve or quarter the new potatoes so they are bite-sized, then add them to the pot. Pour in the vegetable stock and bring to a gentle simmer.
  3. Simmer for 10 minutes, then cut the courgettes into bite-sized pieces and add them. Continue to simmer for 8 minutes, until the potatoes are nearly tender.
  4. Stir in the canned chopped tomatoes and the cannellini beans (drained and rinsed). Simmer for 10 to 12 minutes until the vegetables are tender and the broth tastes rounded.
  5. Meanwhile, make the pistou: crush the remaining garlic clove with a pinch of salt in a mortar, then pound in the basil leaves. Work in a few spoonfuls of hot soup broth to loosen it, then stir in half the parmesan to make a thick, spoonable sauce.
  6. Taste the soup and adjust with a little more salt if needed. Serve the soup hot, passing the pistou and remaining parmesan at the table so everyone can stir in a spoonful to perfume and enrich their bowl.

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Recipe notes

Tips

  • Keep the soup at a gentle simmer so the potatoes turn tender without breaking up and clouding the broth.
  • For the brightest basil flavour, do not boil the pistou in the pot; stir it in at the table or off the heat just before serving.
  • If serving to pregnant people, young children, older adults, or anyone immunocompromised, use a pasteurised hard cheese in place of parmesan.

Substitutions

  • Replace Parmesan with Grana Padano cheese for a similar salty, nutty finish.
  • Replace Cannellini beans with Great northern beans for a slightly firmer texture.
  • Replace New potatoes with Yukon gold potato for a creamier, more velvety broth.

Storage

  • Refrigerate up to 3 days
  • Cool the soup quickly and refrigerate in a sealed container. Store the pistou separately and stir into hot soup when serving; reheat the soup gently on the hob until piping hot. Freeze the soup (without pistou) for up to 3 months, then defrost overnight in the fridge and reheat until piping hot.

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Soupe au Pistou (Vegetable Soup with Basil Sauce)
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Recipe overview

  • Servings: 4 servings
  • Total time: 1h (25min active)
  • Difficulty: Easy
  • Cuisine: French
  • Allergens:
    Milk
Beginner friendly One pot Freezer friendly Kid friendly

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