As per Pat's method described in this link, the key thing to keep in mind is that the oil is added drop by drop as you create the emulsion (that's what the mustard is for, the emulsifying agent) and finishing with a drizzle. You can do it manually if you have a very steady hand with the oil bottle while you beat with a whisk. The mini-processor was designed with this in mind.
7 Comments
Same thing. Or a stick blender.
Cheers!
irina
credit: Bob del Gross recipe, in Michael Ruhlman book, Ratio (2009)