Shanghai Scallion Oil Noodles, or 'cong you ban mian,' are a simple yet delicious dish commonly found in Shanghai. The noodles are cooked until al dente and then tossed in a fragrant scallion oil sauce. The dish is topped with thinly sliced scallions and sometimes garnished with other ingredients like soy sauce, vinegar, or chili oil. It is a quick and satisfying meal that can be enjoyed any time of the day.