Ingredients:

• 1 cup (2 sticks) butter, frozen for at least 30 minutes
• 3 pounds ground beef
• black ground pepper
• 9 slices of sharp cheddar cheese, deli or pre-sliced
• For serving: hamburger buns, lettuce, sliced tomato, thinly sliced red onion

Directions:

1. Place the ground beef in a large bowl. Using a box grater grate the frozen butter over the top of the meat.
2. Form the patties quickly and gently folding the butter into the beef. Shape the burgers into 8-9 patties about 3/4″ thick.
3. Season the patties. Place the patties on a rimmed baking sheet and season both sides with black pepper.
4. Heat an outdoor grill to direct, Grill for 4 minutes each side. Grill the burgers for 4 minutes — expect a few flare-ups as the butter melts. Using a thin metal spatula, flip the burgers and grill until the burgers are browned and crisp on the outside, about 4 minutes more.
5. Serve the burgers. If using cheese, place a slice on each patty during the last minute of grilling.
6. Serve immediately. On hamburger rolls that have been slathered on the cut sides with butter and toasted.