Dice the bacon into small pieces. Cook in the butter in a nonstick pan until browned.
Sprinkle each side of Rocket Patty with sea salt.
Heat a cast-iron pan until hot but not smoking. Coat with the olive oil. Cook the burgers for 4 to 5 minutes per side for medium doneness.
Spread 2 tablespoons peanut butter on each side of the buns and add the bacon to the top half of the buns.
When the burgers are done, sprinkle with a little sea salt, then add them to the buns. Wait a minute for them to melt the peanut butter. Serve.