Mix the first five ingredients together in a small bowl. Refrigerate
until ready to use.
Heat barbecue or gas grill on high heat. Grill frozen burgers to
desired doneness. Season to taste. Toast buns either on the grill
or in a toaster oven.
Assemble the finished product in this order:
Spread 2 tablespoons sauce on top bun and then place 1/3 cup lettuce
evenly over sauce. On bottom bun, place one burger, then one slice
of cheese, then another burger, and another slice of cheese. Follow
this with 3 onion slices and then 2 pickle slices. Finish with top