- Cut lamb across grain into long, thin slices.
- Combine 1 Tbsp. each soy sauce and cornstarch with garlic in small bowl; stir in lamb. Let stand 10 minutes.
- Meanwhile, combine remaining soy sauce, 2-1/2 teaspoons cornstarch, sesame seed, sugar, pepper and 3/4 cup water; set aside.
- Heat 1 Tbsp. oil in hot wok or large skillet over high heat. Add lamb and stir-fry 1 minute; remove.
- Heat remaining oil in same pan. Add carrots and white parts of green onions; stir-fry 2 minutes.
- Add green onion tops; stir-fry 1 minute. Add lamb and soy sauce mixture.
- Cook and stir until sauce boils and thickens. Serve immediately with rice, if desired.