Cut the pork into large pieces. Heat 2 tbsp of vegetable oil in a large pan over medium-high heat, then fry the pork until golden brown, about 8-10 minutes. Season with salt and ground black pepper. Transfer the pork to a plate.
Preheat the oven to 180°C (350°F).
Cut the potatoes into large cubes and the onions into large quarter rings. Add the remaining 2 tbsp of oil to the pan over medium heat. Sauté the onions until translucent, about 5 minutes.
Add the potatoes to the pan and cook, stirring frequently, for 10 minutes.
Seed and slice the peppers into strips. Add to the pan and simmer over medium heat for 5 minutes until softened.
Add the green peas and green beans. Simmer over medium heat for 7 minutes.
Season the vegetables with salt and ground red pepper to taste.
In a large ovenproof pot or pan, arrange the pork on the bottom. Top with the vegetables. Sprinkle with chopped fresh parsley. Pour 1-2 cups of hot water so it reaches approximately 1-1.5 cm below the top of the vegetables. Cover with a lid.
Bake for 1 hour until the pork reaches an internal temperature of 63°C (145°F).