Fix Broken Aioli, Hollandaise, Bernaise Or Other Sauce - cooking recipe

Ingredients

aioli, sauce (or hollandaise or Bearnaise broken)
1 egg yolk (more if you have a large batch)

Preparation

Put egg yolk in a clean bowl.
Whisk it then add the broken sauce drop by drop with continuing to whisk. If you don't have 3 hands or a way to hold the bowl still, you may want someone to help you.
Whisk until the sauce is creamy and homogeneous.
Thin as needed with a splash of water.