To make special sauce, mix ingredients in small bowl. Cover and place in refrigerator. Prepare buns by slicing top bun in half horizontally. Add this slice to a full set of hamburger buns to make one big mac bun.
Roll two 2 ounce beef chunks into the size of two golf balls. Flatten atop wax paper, place another piece on top and set in freezer for a couple hours. When ready, cook on skillet for 1-2 minutes per side.
Spread special sauce, shredded lettuce, and ½ teaspoon minced onion on top of bottom and middle buns. Place one slice American cheese on bottom bun. Place two pickle slices on middle bun. Put a piece of beef on top of middle and bottom buns, combine sandwich.