This is shio yakisoba (salt-seasoned fried noodle). Did not add food color. Ramen noodles contain alkali, alkali turns the purple color of red cabbage to blue. That's why yellow noodles turn into green noodles. If you like to add vinegar to yakisoba, you can turn green yakisoba to PINK yakisoba! The ingredients of the green yakisoba are red cabbage, pork, shrimp, ika, naruto-kamaboko, salt, sesame oil.