Mayonnaise

Preparation

Put the egg yolks and the mustard, together with a pinch of pepper and salt, into the measuring cup.

Blend everything smooth with the hand blender.

Add part of the oil in a thin stream while continuing to blend.

Move the hand blender up and down in a smooth motion each time to incorporate air into the mixture.

When the sauce starts to thicken, add the rest of the oil in a slightly wider stream and keep blending continuously as described above.

Once all the oil has been incorporated, continue blending vigorously for about 30 seconds.

Add the vinegar or the lemon juice.

Taste and season with pepper and salt as desired.