Cut the pork belly into 3cm wide strips.

Heat half of the salad oil (1/2 tbsp) in a frying pan over medium heat. Add the pork and stir-fry until the color changes. Add the bean sprouts and stir-fry briefly.

Season with salt and pepper, mix well, and remove from the pan.

In the same frying pan, arrange the gyoza skins so they overlap slightly. Brush water on the overlapping parts to seal them. Add the remaining salad oil (1/2 tbsp) and heat over medium heat until the skins are golden brown.

Spread the pork and bean sprout mixture evenly on one side of the gyoza skins. Sprinkle shredded pizza cheese on top and cover with a lid. Once the cheese melts, fold the skins over.