Sauce Mayonnaise

Bring the egg yolk to room temperature and place it in a clean, dry bowl; ensure all equipment is free of water or grease, as any moisture will prevent the emulsion from forming.

Add the mustard and salt to the egg yolk and whisk together until combined, creating a slightly thick base that will help stabilize the emulsion.

Begin adding the vegetable oil drop by drop while whisking constantly, ensuring each drop is fully incorporated before adding the next; this gradual process is essential for building a stable emulsion.

Once the mixture begins to thicken and the first few tablespoons of oil have been absorbed, add the remaining oil in a thin, steady stream while continuing to whisk vigorously.

Taste the sauce and add a pinch of sugar, then adjust the acidity with vinegar to taste, whisking until the flavoring is evenly distributed.

Continue whisking until the mayonnaise reaches a thick, creamy consistency and is pale in color; if the mixture becomes too thick, thin it slightly with a few drops of vinegar.