For the smash burgers

• Fire up your grill for medium-high heat. Place a griddle or a large cast iron pan over the highest heat.
• Spread half of the butter on the cut sides of the buns.
• Add the buns to the griddle cut-sides down and grill until nicely toasted. Remove to a plate.
• Add remaining butter to the griddle and swirl it around as it melts.
• Add the balls of ground beef. Let them cook untouched for 2 minutes then flatten out with a spatula or burger press.
• Season the tops liberally with salt and pepper and cook another minute.
• Flip the patties and season again.
• Let the patties cook until you start to notice a little char along the edges.
• Top patties with cheese and let cook another 30 seconds to melt the cheese.
• Remove the patties and place on bun bottoms.
• Add remaining ingredients to assemble the burgers.
• Devour immediately.