Prepare the mayonnaise.
For its preparation, it is better to use a large capacity and not very wide. For example, a liter jar.
Put the quail eggs in a container. (the integrity of the yolk does not matter)
Pour in refined sunflower oil, add lemon juice, salt, sugar, Dijon mustard. If you use a tablespoon of mustard, then 1/2 teaspoon of mustard will be enough.