Nutrition information per serving: 124 calories; 6 g fat; 2 g saturated fat; 44.2 mg cholesterol; 75.2 mg sodium; 0.6 g carbohydrate; 0 g fiber; 0.5 g sugar; 15.9 g protein
Whisk oil, soy sauce, vinegar, garlic, pepper, and brown sugar until the sugar dissolves. Place meat in a shallow dish and pour marinade over. Cover and refrigerate for at least 30 minutes, up to overnight.
Preheat a large cast-iron skillet over medium-high heat.
Place steak in a skillet for 4 minutes, flip, and cook for an additional 3–4 minutes, or until internal temperature reaches 145°F.
Allow steak to rest for 5 minutes before slicing and serving.