Set your prep station first: gather cold leftover rice, cut pork belly into small cubes, beat the eggs, slice mangoes, chop spring onions, and mince garlic.
In a bowl, mix pork cubes with salt, black pepper, and sesame oil. Let this sit for 30 minutes.
Heat your wok or large pan over high heat. Add oil and fry the marinated pork until golden brown and crispy, about 5-7 minutes. Remove pork and set aside.
In the same wok, fry minced garlic until light golden. Add your cold rice and bagoong. Keep stir-frying for 3 minutes, making sure the rice gets evenly coated with bagoong.
Push all the rice to one side of the wok. Pour beaten eggs into the empty space. Once the eggs start to set, break them up and mix with the rice.
Add back your crispy pork and spring onions. Season with salt and pepper as needed. Give everything a final stir for about a minute.
Transfer to serving plates and top with sliced mangoes. Serve hot.
For the best texture, make sure your rice is cold from the fridge and your wok is very hot before cooking. If the rice starts sticking together, add a little more oil and break up any clumps with your spatula.
This makes enough for 5 servings. You can keep leftovers in the fridge for up to 3 days, but the mangoes should be added fresh when serving.