Add <quantity>25<unit>g</unit></quantity> of mustard and <quantity>100<unit>g</unit></quantity> of egg yolk to the cup of a blender

Add <quantity>30<unit>ml</unit></quantity> of lime juice and salt to taste

Blend on low speed, adding <quantity>450<unit>ml</unit></quantity> of vegetable oil in a thin stream until the mayonnaise builds up. The mayonnaise is ready

Enjoy it with your best hamburger!