Add all of the ingredients for the olive spread to a mixing bowl and mix well. Place in the refrigerator for at least an hour to tighten the spread up.
Light your grill and set it up for two zone cooking. While the grill is preheating, form the ground beef into four equal sized patties. Season with salt and pepper.
Place the burger patties on the grill over direct heat. Sear for two minutes on each side to develop a charred crust. Then move the patties over indirect heat, and close the lid. Allow the burgers to cook until they reach desired doneness. About a minute before they’re done, top with optional Swiss cheese and let it start to melt.
Evenly coat the cut side of all the buns with olive oil, and toast on the grill or in a pan.
Assemble the burgers on the bun, lettuce first on the bottom bun to prevent the bun from getting soggy. Top with burger patty, olive spread, and top bun.