8 ounces chuck, trimmed, cut into 1 1/2-inch cubes 8 ounces sirloin, trimmed, cut into 1 1/2-inch cubes 1/2 teaspoon kosher salt
In separate batches, pulse the chuck and the sirloin in a food processor 10 times. Combine the chuck, sirloin, and kosher salt in a large bowl. Form the meat into 5-ounce patties. Heat a cast iron skillet or griddle over medium-high heat for 2 to 3 minutes. Place the hamburger patties in the pan. For medium-rare burgers, cook the patties for 4 minutes on each side. For medium burgers, cook the patties for 5 minutes on each side. Flip the burgers only once during cooking.
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