Mayonnaise failed?

The mayonnaise is sifting: The mustard and egg should stay together nicely to have a consistent bond, soar slowly upward so that the oil slowly passes through the egg-mustard mixture.

The mayonnaise can be too thick or too runny. Use a blunt-head immersion blender so that all the ingredients stay together nicely.

If you taste the taste of the oil too much, use the wrong oil. Use a tasteless oil such as peanut oil, sunflower oil, corn oil, ...