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Pat the sirloin steaks thoroughly dry with paper towels. Season both sides generously with 1 teaspoon of kosher salt and 1/2 teaspoon of freshly ground black pepper.
Heat a heavy-bottomed pan, such as a cast iron skillet, over medium-high heat until it is smoking slightly. Add 2 tablespoons of canola oil to the hot pan, ensuring it coats the bottom.
Carefully place the seasoned sirloin steaks into the hot pan, ensuring not to overcrowd the pan. Cook for 3 to 4 minutes per side for medium-rare, or 4 to 5 minutes per side for medium doneness. A good crust should form.
Reduce the heat to medium-low. Add 4 tablespoons of unsalted butter, 4 minced garlic cloves, and 2 fresh rosemary sprigs to the pan. Tilt the pan slightly and, using a large spoon, continuously baste the melted garlic butter over the steaks for 1 to 2 minutes.
Remove the steaks from the pan and transfer them to a cutting board. Let the steaks rest for at least 5 to 10 minutes before slicing. This allows the juices to redistribute, resulting in a more tender and flavorful steak.
Slice the sirloin against the grain into desired thickness, or serve whole. Drizzle any remaining pan juices and garlic butter over the sliced steak before serving.

Pat the sirloin steaks thoroughly dry with paper towels. Season both sides generously with 1 teaspoon of kosher salt and 1/2 teaspoon of freshly ground black pepper.
Heat a heavy-bottomed pan, such as a cast iron skillet, over medium-high heat until it is smoking slightly. Add 2 tablespoons of canola oil to the hot pan, ensuring it coats the bottom.
Carefully place the seasoned sirloin steaks into the hot pan, ensuring not to overcrowd the pan. Cook for 3 to 4 minutes per side for medium-rare, or 4 to 5 minutes per side for medium doneness. A good crust should form.
Reduce the heat to medium-low. Add 4 tablespoons of unsalted butter, 4 minced garlic cloves, and 2 fresh rosemary sprigs to the pan. Tilt the pan slightly and, using a large spoon, continuously baste the melted garlic butter over the steaks for 1 to 2 minutes.
Remove the steaks from the pan and transfer them to a cutting board. Let the steaks rest for at least 5 to 10 minutes before slicing. This allows the juices to redistribute, resulting in a more tender and flavorful steak.
Slice the sirloin against the grain into desired thickness, or serve whole. Drizzle any remaining pan juices and garlic butter over the sliced steak before serving.