In a bowl, combine minced pork lung (or bopis mix), vinegar, and salt. Marinate for about 10 minutes.
In a wide skillet over medium heat, heat oil. Add onions and garlic and cook until softened.
Add fish sauce.
Add minced pork lungs and bring to a boil. Cook, stirring occasionally, for about 20 to 30 minutes or until liquid is mostly absorbed and meat begins to sizzle.
Add carrots, bell peppers, and chili peppers. Continue to cook for about 2 to 3 minutes or until vegetables are tender-crisp.
Video
Notes
Pork lungs are not available in the U.S. markets due to stringent regulatory laws. You can substitute pork hearts and finely chop with a knife or pulse in a food processor.