Rinse the potato slices under running water to wash the starch off the surface, drain well and dry with a paper towel.
In a non-stick pan, add some oil and spread the potato slices in a single layer, cook the potato slices with low heat for about 3 minutes each side until crisp and browned, set aside (cook in batches, if needed).
After removing the potato from the pan, add in the pork belly slices, sprinkle with some salt and black pepper, pan fry for about 5 minutes until cooked and browned, set aside the pork belly, drain most of the oil in the pan, leaving about 1 tablespoon worth.
Toss in green pepper, ginger, garlic, dried chili pepper and peppercorn, stir fry for 2-3 minutes under medium-high heat until fragrant.
Stir in the pork belly and potato slices and add soy sauce and sugar, stir fry for another 1-2 minutes and then remove from heat, plate and serve.
Notes
When cooking with a non-stick pan, avoid cooking over high heat and using nonstick cooking spray.