Cut the duck magret into strips (approximately 5 cm.) Cut asparagus spears into 5 cm pieces. In a mixing bowl, mix cornstarch, egg white and duck strips, set aside. In a large wok over high heat, heat the oil and add the duck meat, ginger, garlic, asparagus and carrot and stirfry for 6 minutes. Add bean sprouts and scallions and cook for another three minutes. Add soy sauce and serve immediately. Garnish with chopped cilantro.