Throw together (as desired):
Add mayonnaise of some sort (personally, I like Grape Seed Oil Veganase: http://followyourheart.com/products/grapeseed-oil-3/).
I like to add (prepared yellow) Mustard at a 2:1 ratio with mayo.
Simple. Doesn't always come out the same this way. That's part of the risk. But it's easy.