Make Homemade Mayonnaise Recipe now: whisk egg yolk, mustard, vinegar and slowly add oil for silky, fresh mayo.
In a medium bowl whisk the single large egg yolk together with the tablespoon of Dijon mustard and the tablespoon of white wine vinegar until the mixture is homogeneous and slightly glossy; this is the flavor base and emulsifier, so whisk with intention until the three ingredients form a smooth, even pale yellow slurry.
Hold a small jug of neutral-flavored oil and, while whisking continuously, start adding oil drop by drop to the yolk mixture so the fat can begin to emulsify into tiny suspended droplets; keep the whisk moving vigorously and maintain a calm, steady rhythm so the mixture begins to thicken rather than separate.
As the mixture registers a visible thickening and the texture changes from glossy liquid to a soft, creamy body, begin adding the oil in a thin, steady stream while still whisking hard — this is the critical visual transition where separate liquids become a stable, velvety emulsion, with the bowl filling with pale, satiny mayonnaise.

Continue whisking until all the oil is incorporated and the mayonnaise reaches a thick, silky consistency that holds gentle peaks and clings to the whisk; check texture and correct any slight thinness by whisking a little longer until perfectly smooth.
Stir in salt and freshly ground white pepper to taste, sampling briefly and adjusting so the seasoning lifts the richness without flattening the delicate creamy note.
Spoon the finished mayonnaise into a serving jar or into the same mixing bowl, swirl to create a soft peak, tuck a gleaming spoon in if serving immediately, or transfer to an airtight container and refrigerate for up to one week.
