This recipe was pretty good, I overcooked the beef a bit so it could have been better. I would cook the beef to rare at first and then when you add it back to the pan it will cook the rest of the way.
1 lb beef, strip sirloin, trimmed, raw, cut into thin strips
1/4 cup low-sodium soy sauce, divided
1/2 cup fresh orange juice
3 tbsp unpacked light brown sugar
1 tbsp apple cider vinegar
1 tbsp orange zest
1/2 tsp crushed red pepper flakes
2 tsp sesame oil
2 cups carrots, matchstick-cut
1 medium onion, cut into 8 wedges and separated
Place beef in a shallow dish; pour 2 tablespoons soy sauce over beef. Turn to coat completely. Let marinate 15 minutes in refrigerator.
Combine orange juice, sugar, 2 tablespoons soy sauce, vinegar, orange rind and red pepper in a small bowl. Stir with a whisk.
Heat oil in a large nonstick skillet over high heat. Add beef and cook 6 minutes. Remove from heat and place on a serving platter; keep warm.
Reduce heat to medium-high; add carrot and onion. Cook 7 minutes or until carrot is lightly browned and crisp-tender, stirring frequently. Increase heat to high; add beef and its juices and orange juice mixture. Cook 3 minutes or until slightly thickened.