Mandu is a type of food that looks like a little pocket of dough filled with yummy ingredients. Kind of like a tiny sandwich that's made out of dough instead of bread.
But wait, there's more! These little pockets can be filled with all sorts of things like meat, veggies, and even sweet fillings like chocolate or red bean paste.
Once the pockets are filled, they are either boiled or fried until they're nice and crispy on the outside and warm and gooey on the inside.
You can eat mandu as a snack, a meal, or even as part of a bigger dish like soup. They're super yummy and lots of people love eating them!