Also, if you ever have a chance to go to BurgerFi, they are a clone of 5 Guys, but with better meat (although the Cajun fries aren't as good as 5 Guy's). Fewer locations though:
http://burgerfi.com/locations
One of their key ingredients is their burger sauce, which I successfully cloned the other day. Throw all of this in a blender:
1 cup mayo (regular, not olive-oil flavored & not low-fat)
1/3 cup Heinz ketchup
1 clove (segment) of garlic
1/3 sweet pickle spear (like a Vlasic)
Salt to taste (balances out the sweetness)
It's almost like a Thousand Island dressing or fry sauce, but a bit on the sweeter side. Since I can't do buns (gluten allergy), I do lettuce wraps ("greenstyle") instead, which are pretty boring unless you have the right sauce - and this is the ticket. Also, I make my own mayo using this recipe & an immersion (stick) blender:
http://www.seriouseats.com/2011/10/the-food-lab-homemade-mayo-in-2-minutes-or-le.html
1 cup safflower oil (canola works too, but safflower comes out thicker, with more body)
1 tablespoon lemon juice (I use bottled ReaLemon)
1 tablespoon water (key ingredient!!)
1 teaspoon dijon mustard
Salt (to taste)
1 egg yolk (no egg white)
My immersion blender was $50 & has a truckload of attachments: (this sucker is magic!)
http://www.davelikesfood.com/post/94451354989/mayo-update-immersion-blender
It literally takes 30 to 60 seconds to make a jar of homemade mayo, which you can then flavor however you want - plain mayo, garlic aioli, fry sauce, burger sauce, Thousand Island, chipotle mayo, etc.
Super creamy & no preservatives or other junk ingredients. We spent the evening cloning the BurgerFi sauce recipe at my buddy's house the other day & it was a huge hit, even though we did greenstyle burgers for everyone (no buns). Tastes great with chopped raw onions btw. We did it with smash burgers (3-minute skinny burgers):
http://www.thepauperedchef.com/2008/12/the-smash-technique-and-skinny-burger-perfection.html
We found the trick to doing the lettuce wrap is to make a clamshell out of the lettuce - if you just do lettuce leafs, it falls apart & is super messy. Easiest thing to do is cut off the top & bottom of the head of lettuce, then slice one side open so it kind of pulls apart into a big flat sheet - that way you can clamshell it over the burger, slice off the sides so it's kind of square, and it makes a great wrap for holding all of the ingredients in. I'll probably be making this every week as my new default burger, so +1 for reverse engineering! :awe: