Pistou: The Provençal Basil Paste

Pistou is Provence’s answer to Genoese pesto—a raw paste of fresh basil, garlic, olive oil, and (optionally) Parmesan, pounded in a mortar until it becomes a vibrant, emerald-green sauce of extraordinary aromatic intensity. While it shares a common ancestor with pesto (both names derive from the Latin pistare, to pound), pistou is distinguished by several critical absences: no pine nuts, no butter, and in the strictest Provençal tradition, no cheese. These omissions produce a purer, more intensely basil-forward preparation that is lighter and more versatile than its Ligurian cousin. The technique demands a marble mortar and wooden pestle: two cloves of garlic are pounded with coarse salt to a smooth paste, then the basil leaves (60-80 large leaves from Provençal petit basilic, never the large-leafed Genovese variety) are added in batches, pounded to a rough paste, and olive oil is drizzled in while continuing to work the mortar. The pounding action—a grinding, rotating motion—ruptures the basil’s cell walls differently than a blade, releasing the aromatic compounds more completely and producing a paste that tastes more intensely of basil than any blended version. The finished pistou should be thick, rough-textured, and brilliantly green. Its primary application is stirred into Soupe au Pistou at the table, but it also adorns grilled vegetables, pasta, fish, and eggs. The paste must be used within hours of preparation—it oxidises rapidly, turning brown and losing its ethereal freshness.

Pound in a mortar—blending with a machine oxidises the basil and produces a different, inferior flavour. Use Provençal petit basilic or sweet basil with small leaves—large-leafed varieties are coarser. Add oil gradually to create an emulsion, not a separated mixture. Use immediately or within hours—pistou does not keep. No pine nuts, no butter—these belong in pesto, not pistou.