Whisk the yolks and mustard
3 minUse pasteurized eggs because the raw egg in this sauce is not cooked; do not make this sauce with eggs whose packaging does not say pasteurized. Put the pasteurized egg yolks in a wide bowl and add the mustard and salt. Whisk until the yolks loosen and become a shade lighter. Place a damp towel under the bowl so it does not slip, leaving both hands free.