Preheat the oven (conventional oven) to 350F.
Heat a Dutch oven in a stovetop.
Pour-in the cooking oil.
Once the oil gets hot, saute the onion and garlic.
Add the pork belly slices. Cook until the pork turns light brown. Turn-off the fire or heat from the stovetop.
Pour the tomato sauce and beef broth in the Dutch oven. Add the peppers and peas. Cover and place inside the conventional oven. Let it stay inside the oven for 2 hours at 350F.
Remove from the oven, add salt and pepper to taste.
Serve. Share and enjoy!