-
Start the base: In a medium bowl, whisk the egg yolk, Dijon mustard, and lemon juice until smooth. This creates the foundation that helps the sauce thicken.
-
Add the oil slowly: While whisking constantly, drizzle in the oil a few drops at a time. Once the mixture begins to thicken, you can add the oil in a thin, steady stream. The key is slow and steady.
-
Season to taste: When all the oil is incorporated, the mayonnaise should be creamy and thick. Add a pinch of salt and a touch of sugar if you like a hint of sweetness.
-
Adjust the texture: If it is too thick, whisk in a teaspoon of warm water to loosen it.
-
Store: Transfer to a clean jar and refrigerate for up to one week.