To be honest this method is all over the Internet but most come with no measures for the ingredients. When I finally tracked one down that did have them they were American measures. So ... for all sensible chefs that use sensible measures I thought I'd include them here. (Only joking!)
I didn't believe it when I first saw the method but it really does work and takes less than five minutes. Also there is no arm ache or careful dribbling of oil.
Crushed garlic can always be added along with the egg and mustard.