French Soupe au Pistou
A rustic Provençal vegetable soup loaded with zucchini, green beans, tomatoes, and tender white beans, finished with a drizzle of pistou—a bright, garlicky basil sauce that transforms simple ingredients into something deeply satisfying. This is the kind of soup that tastes like sunshine in a bowl, perfect served warm with crusty bread.
- Prep
- 20 min
- Cook
- 35 min
- Total
- 55 min
- Makes
- 6 servings (about 8 cups total)
Steps
Before you start
- Gather and prep all vegetables before you begin cooking
- Have fresh basil ready and at room temperature
- Use a good quality olive oil for the pistou
Sauté the aromatics
- Heat 3 tablespoons olive oil in a large heavy-bottomed soup pot over medium heat.
- Add the diced yellow onion and cook, stirring occasionally, until softened and translucent, about 5 minutes.
- Add the 2 minced garlic cloves and stir constantly for 30 seconds until fragrant.
- Do not let the garlic brown.
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Ready when: Onion is translucent and garlic is fragrant
Tip: Keep the heat at medium to prevent garlic from scorching, which makes it bitter.
Add vegetables and broth
- Stir in the diced zucchini and green bean pieces.
- Cook for 2 minutes, stirring occasionally, to coat them lightly with oil.
- Pour in the crushed tomatoes and vegetable broth, scraping up any browned bits from the bottom of the pot.
- Bring the mixture to a gentle boil, then reduce the heat to maintain a steady simmer.
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Ready when: Mixture reaches a gentle boil
Tip: Don't overcrowd the pot by adding vegetables all at once; they cook more evenly if you build the soup in layers.
Simmer the soup
- Maintain a gentle simmer and cook for 15 minutes.
- The zucchini and green beans should be tender but not falling apart, and the broth will have taken on some of the vegetable flavors.
- Stir in the drained cannellini beans and cook for another 3 minutes to heat them through.
- Season generously with kosher salt and freshly ground black pepper to taste.
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Ready when: Zucchini and green beans are tender; beans are heated through
Tip: Taste and season conservatively at first—the pistou will add saltiness from the cheese and olive oil.
Make the pistou
- While the soup simmers, prepare the pistou.
- In a mortar and pestle or small food processor, combine the 3 peeled garlic cloves and 1.5 cups fresh basil leaves.
- Pound or pulse until coarsely broken down.
- Add the 2 tablespoons pine nuts and pulse again until roughly chopped.
- Transfer to a small bowl and stir in the 0.5 cup grated Parmigiano-Reggiano.
- Slowly drizzle in the 0.5 cup olive oil while stirring constantly until the mixture forms a thick, pesto-like paste.
- Taste and adjust seasoning with a pinch of salt and pepper if needed.
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Ready when: Mixture resembles thick pesto with visible basil flecks
Tip: Don't over-process the pistou; it should be chunky and textured, not completely smooth. Keep it bright green by avoiding lengthy blending.
Finish and serve
- Ladle the hot soup into serving bowls.
- Top each bowl with a generous spoonful (about 2 tablespoons) of pistou and stir gently to distribute.
- Serve immediately while the soup is hot and the basil flavor is at its most vibrant.
- Offer extra crusty bread on the side for soaking up the broth.
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Ready when: Soup is hot and fragrant; pistou is swirled through
Tip: Add the pistou just before serving so the basil flavor stays fresh and bright. If you prefer a thinner soup, add extra broth; if you like it thicker, simmer uncovered for a few extra minutes.
Good to know
Tips
- Soupe au Pistou is a celebration of summer vegetables—feel free to swap in seasonal produce like bell peppers, carrots, or fresh corn kernels for some of the zucchini or green beans, keeping the total vegetable weight roughly the same.
- For a more herbaceous pistou, add a handful of fresh flat-leaf parsley alongside the basil, but keep basil as the dominant flavor.
- If you don't have a mortar and pestle, a small food processor works beautifully, but pulse in short bursts to avoid making the mixture too fine and losing the pleasant texture.
- This soup is naturally vegan if you simply omit the Parmigiano-Reggiano from the pistou—drizzle a little extra good olive oil over each bowl instead.
Make ahead
The soup base (through step 3) can be made up to 2 days ahead and stored in the refrigerator. The pistou is best made fresh within 1 hour of serving, but can be prepared up to 4 hours ahead and stored in an airtight container in the refrigerator. Reheat the soup gently over medium-low heat before serving and top with fresh pistou.
Storage & reheating
Room temperature: up to 2 hours. Refrigerator: up to 3 days (store soup and pistou separately in airtight containers). Freezer: up to 3 months (freeze the soup base without pistou; thaw overnight in the refrigerator and reheat over medium-low heat; make fresh pistou to serve). Do not freeze the pistou, as basil loses its bright color and flavor.
Substitutions
- fresh green beans → Fresh diced eggplant or yellow summer squash. Use the same weight and cut size for consistent cooking time.
- canned cannellini beans, drained and rinsed → Cooked chickpeas or borlotti beans. Maintains the hearty, protein-rich character of the soup.
- fresh basil leaves, packed → Fresh mint or a combination of basil and parsley. Mint adds a different but equally refreshing note; use 1 cup mint to 0.5 cup basil if mixing.
- pine nuts → Walnuts or almonds, lightly toasted and finely chopped. Provides the same textural richness at a lower cost.
