Tokkjú mentenši (S01E02)

Mao and friends return to Yang Spring Restaurant. When Shirou serves a dish to a customer without permission, the customer becomes enraged, and Mao offers to serve whatever dish the customer would like. The customer demands he cook a dish using three different types of eggs, and Mao serves shumai prepared according to the customer's demands. Impressed by the dish, the customer makes another unexpected demand. He is Dim Sum Master Xie Lu, and he challenges Mao to a cooking battle... (Crunchyroll)