Ingredients
1 Egg Yolk. (choose best quality eggs to get the best taste possible)
A pinch of salt
A pinch freshly ground white pepper
A few drops of white wine vinegar
150 mls of light or clarified olive oil
teaspoon Dijon mustard
Method
In a medium-size bowl, combine the egg yolk, salt, pepper, mustard and white wine vinegar.
Using a whisk, gently blend the ingredients by hand.
(Do not use an electric blender as it will destroy the texture.)
Once well mixed, begin to add one drop of olive oil at a time, and mix till it is smoothly absorbed.
Continue whisking and stirring with the right hand while adding with the left.
As the mixture becomes paler add a few drops at a time, then a teaspoon, tablespoon etc,
until all the oil is fully integrated into the mixture.
Add immediately to the salad just before serving,
or close in a jar in the fridge for later use.
With the French, any variation on this recipe earns a different name. For instance, substitute garlic for the mustard and the sauce is called an Aioli; lemon juice for vinegar and it's an Hollandaise.