A traditional Korean candy made of carmelized sugar and a pinch of baking soda, Bbopki (or bobki) is usually formed into round disks or molded onto a stick as a lollipop. You can find bbopki on many streets in Korean cities and towns, and the simple ingredients and preparation don't even require a full street food stall. Often, you will just see the vendor making bbopki sitting over a hot plate on a table.
Many bbopki vendors stamp the candy with a design or shape, and if you manage to eat around the shape without breaking it, then you can get another Bbopki for free. The candy tastes like a slightly burnt campfire marshmallow, and it's very sweet.