Homemade Aioli
Real aioli is garlic emulsified into egg yolk and olive oil — essentially a garlic mayonnaise made by hand. The mortar-and-pestle method from Provence produces the silkiest result, but a bowl and whisk works fine. Use good olive oil (the flavor has nowhere to hide) and enough garlic to make a statement.
Instructions
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Pound the garlic with a generous pinch of salt in a mortar until you have a smooth paste. (Alternatively, mince the garlic and mash it with the flat of a knife and salt on a cutting board until it becomes a paste.)
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Transfer the garlic paste to a medium bowl. Add the egg yolks and whisk until combined.
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Begin adding olive oil drop by drop, whisking constantly. This is not an exaggeration — the first 2 tablespoons must go in one drop at a time. If you rush, the emulsion will break.
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Once the mixture begins to thicken and look like mayonnaise, you can increase to a thin, steady stream. Continue whisking and adding oil until all of it is incorporated.
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Whisk in lemon juice and cold water. Taste and adjust salt.
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Cover and refrigerate. Aioli keeps for up to 4 days. The garlic flavor will intensify as it sits.