In skillet, cook ground beef until browned. Drain excess fat. Add shredded carrots, soy sauce, brown sugar, lime juice, and sesame oil. Stir and cook for 2–3 more minutes until fragrant and well combined. Season with salt and pepper. Remove from heat
To serve, spoon warm beef mixture into lettuce leaves. Top with Fresno chilis and extra scallions if desired. Enjoy!