Aioli

True Provençal aioli — 'all-i-oli' in Catalan, from 'all' (garlic) and 'oli' (oil) — is a pure emulsion of garlic and olive oil with no egg yolk. This distinguishes it from the garlic mayonnaise that most of the world calls aioli: the traditional Provençal preparation uses only garlic, salt, and olive oil, with the garlic's own lecithin and gum compounds providing whatever emulsification occurs. The resulting sauce is unstable, extremely thick, intensely flavoured, and technically demanding to make. The garlic is pounded to a completely smooth paste with coarse salt in a mortar — this step is non-negotiable; any graininess or fibrous texture will prevent proper emulsification. Olive oil is then added a drop at a time while the pestle works continuously to incorporate each drop before the next is added. The result, when successful, is a thick, pale yellow paste with a pungency that authentic Provençal cooks consider completely appropriate. It is eaten not as a condiment but as a full dish: 'Le Grand Aïoli' is a Provençal feast of boiled vegetables, salt cod, boiled eggs, and snails all served with enormous quantities of aioli at the centre of the table. Modern aioli — made with egg yolk for stability — is an easier preparation but a different sauce. Egg yolk provides powerful emulsification, allowing a much higher oil ratio and producing a milder, creamier sauce. This is closer to garlic mayonnaise than traditional aioli, but it is what most restaurants serve.