2 egg yolks

4 tbsp lime juice

2 tbsp tequila 

Mix well together in a blender or in a bowl with a stick blender

1 - 1 ½ cups Canola or vegetable oil

Drizzle the oil in very slowly while the blender is running, until the mayonnaise becomes thick and develops a creamy shine to it.

Taste the mayo, and it should have a nice balance of creaminess and a tiny bit of sharpness from the vinegar.  If too sharp add more oil.  adjust seasoning

As a simpler alternative, just add the same quantity of lime juice and tequila to 1 ½ cups of plain store bought mayonnaise - but this won't be anywhere near as good as the real thing!