There are moments in “A Bite of China” that stay with you long after you watch the show. A mother and daughter walking together at dawn, digging for mushrooms in the mountains of Yunnan. They easily push their sticks in the dirt to gently push up a priced mushroom that sells for thousands in city restaurants. Inside a ger in Inner Mongolia, in the early hours, a woman dips a ladle in milk to make breakfast for the family. The man will herd their sheep on the grassy plain. Fermented tofu nuggets are laid out on baskets on a balcony before they are hauled out to a busy city sidewalk and sold. The most simple yet amazing street food. More than technique and skill, “A Bite of China” is about taste and heritage, habit, livelihoods, the knowledge and skill that comes from working with food all your life, as well as the pride and appreciation of people working in food, really getting their hands in, and knowing the natural, subtle chemistry of food. The show …