These things are simple and clear, but it is not easy for you to make these things classic. Even if you join, it may not make them classics. You must go through your own exploration and time precipitation. There is a shortcut, but it takes time. Find a shop you know that sells these things as a waiter and steal them after a long time. Another point is the old supplier.

Roasted wings with milk tea and coffee (pickled). Meatballs are semi-finished products. You can handle it yourself. The milkshake hand-grabbed cake is to be processed, involving a little more aspects. You haven't done it, but you can learn it well just by reading the written materials.