Aioli — The Mortar and the Patience

Ingredients

• 20 g Violet de Cadours or fresh hardneck garlic, peeled, green germ removed if present
• 1 tsp coarse sea salt, for pounding as abrasive
• 200–250 ml Provençal extra-virgin olive oil, room temperature; must be worth tasting alone
• to taste lemon juice, added at the end only
• Optional (for stability)
• 1 egg yolk, room temperature
• Optional (for rescue)
• 1 fresh garlic clove, reserved in case of breakage
• Optional (for consistency)
• a few drops warm water, to loosen if sauce becomes too thick

Method

1. 1
   Set a stone or ceramic mortar on a damp towel to prevent it sliding. Confirm that the mortar, garlic, and oil are all at room temperature — 18–22 °C. Cold oil is more viscous and will resist emulsification; cold garlic resists breakdown. Place the peeled cloves in the mortar, add the coarse sea salt, and pound in a firm, continuous circular motion, pressing the paste against the sides and bottom. Do not bash. Scrape the sides regularly. Work for 3 to 5 minutes until the paste is utterly smooth, wet, and without a single visible fibre of garlic. The paste should feel cohesive and sticky under the pestle.
2. 2
   This is where the dish lives or dies: before the first drop of oil falls, the garlic paste must be perfectly smooth and cohesive. Begin adding oil one drop at a time, grinding continuously in the same circular motion. Maintain constant, rhythmic pressure — speed matters less than consistency. Watch and feel: after the first 50 ml, the resistance beneath the pestle will change. The paste stiffens, it begins to drag, and the colour shifts from translucent grey-green to opaque ivory. That change in resistance is the emulsion forming.
3. 3
   Once the emulsion has caught and the paste is visibly thicker and opaque, increase the oil flow to a thin, steady stream, continuing to grind. Add oil up to a total of 200–250 ml for the 20 g of garlic. The ratio is roughly 50 ml of oil per large clove; exceeding this overwhelms the garlic's emulsifying capacity and the sauce will thin and break. If the aioli becomes too thick to work at any point, add a few drops of warm water — not lemon juice — to loosen it without destabilising the emulsion.
4. 4
   Season with lemon juice to taste, added only at the end, once the emulsion is fully stable. Acid introduced earlier thins the emulsion before it can absorb it without breaking. Stir briefly to incorporate. Taste: the aioli should deliver garlic heat that builds slowly, followed by fruity oil sweetness, then a long peppery finish from the olive oil's polyphenols.
5. 5
   Test the finished sauce: lift the pestle. The aioli should hold a firm peak. It should smell intensely of raw garlic with a clean olive-oil backdrop — no metallic or acrid notes. The colour should be pale ivory to light gold. Serve at room temperature. If the sauce has been made ahead and thickened further, thin to final consistency with warm water just before serving.
6. 6
   If the emulsion breaks, do not discard it. Pound one fresh garlic clove to a smooth paste in a clean mortar with a pinch of salt. Add the broken sauce into the new paste teaspoon by teaspoon, grinding continuously, until it re-emulsifies. The rescue follows the same principle as restarting a broken mayonnaise with a fresh yolk.