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Place the sirloin in the freezer for 10 minutes to firm up, making it easier to slice thinly. While the beef chills, prepare the other ingredients.

Remove the firm sirloin from the freezer and slice it against the grain into thin strips, about 1/4-inch thick.

In a medium bowl, combine the sliced beef with salt, black pepper, cornstarch, and light brown sugar. Toss until the beef strips are evenly coated.

Heat 1 tablespoon of neutral oil in a large skillet or wok over high heat until shimmering. Add half of the beef strips in a single layer, ensuring not to overcrowd the pan. Sear without stirring for 2 minutes until deeply browned on one side.

Flip the beef and cook for an additional 20 seconds. Transfer the seared beef to a clean plate and repeat with the remaining 1 tablespoon of neutral oil and the second batch of beef. Set all seared beef aside.

In the same skillet, add the sliced celery, grated garlic, scallion whites, and wide strips of lemon peel. Sauté over medium-high heat for about 1 minute, until the celery is slightly softened and fragrant.

Return the seared beef to the skillet. Add the soy sauce and unsalted butter. Toss continuously for about 30 seconds until the butter has melted and a smooth sauce coats the meat and vegetables.

Remove the skillet from the heat. Squeeze fresh lemon juice from the zested lemon over the stir fry. Discard the lemon peel strips.

Serve immediately, garnished with the reserved scallion greens.


Place the sirloin in the freezer for 10 minutes to firm up, making it easier to slice thinly. While the beef chills, prepare the other ingredients.

Remove the firm sirloin from the freezer and slice it against the grain into thin strips, about 1/4-inch thick.

In a medium bowl, combine the sliced beef with salt, black pepper, cornstarch, and light brown sugar. Toss until the beef strips are evenly coated.

Heat 1 tablespoon of neutral oil in a large skillet or wok over high heat until shimmering. Add half of the beef strips in a single layer, ensuring not to overcrowd the pan. Sear without stirring for 2 minutes until deeply browned on one side.

Flip the beef and cook for an additional 20 seconds. Transfer the seared beef to a clean plate and repeat with the remaining 1 tablespoon of neutral oil and the second batch of beef. Set all seared beef aside.

In the same skillet, add the sliced celery, grated garlic, scallion whites, and wide strips of lemon peel. Sauté over medium-high heat for about 1 minute, until the celery is slightly softened and fragrant.

Return the seared beef to the skillet. Add the soy sauce and unsalted butter. Toss continuously for about 30 seconds until the butter has melted and a smooth sauce coats the meat and vegetables.

Remove the skillet from the heat. Squeeze fresh lemon juice from the zested lemon over the stir fry. Discard the lemon peel strips.

Serve immediately, garnished with the reserved scallion greens.
