What Beijing's street foods are there?

Do you know if there are any authentic local snacks in Beijing? Thank you for your recommendations everyone.
Types of snacks are many, including steamed stuffed bun, wax gourd pastry, tarry apple cake, rolling donkey, date paste, exploded stomach, bean soup, sugar fired rice cakes, stir-fried liver, smoked cooking firecakes, and bean liquid fried sticks etc. And there are still countless more, depending on what kind of snack you’d like to eat. You can also choose to try the snacks at Tiananmen Street, Fresh Fish-mouth Street, or Hutong Temple Street.
Small eat varieties many, Gluttonous, Yellow Soybeans Cake, Hill Cactus Cookie, Donkey Kicks a Ball, Date Seed Creamy, Puffed Abdomen, Bean Soup Stew, Sugar Fire Roast, Fried Liver, pickled oil and chili roast, bean juice crispy ring, etc., still numerous various types to choose. See which kind you like or come to the front gate street, Xianyu entryway, Huguosi small eatery to taste them.