Start by salting the egg yolks and thoroughly whisking them together. Gradually add the oil while mixing well until you achieve a smooth, homogeneous mixture.
Next, add vinegar. If the sauce is too thick, stir in a tablespoon of warm water to loosen it up.
For those who enjoy a bit of heat, we recommend adding a touch of mustard, which should be mixed in with the yolks before incorporating the oil.
The basic recipe calls for half a cup of oil, one egg yolk, a tablespoon of vinegar, and half a teaspoon of salt.