Heat a large pan over medium heat. Add the vegetable oil and onion, garlic, and ginger, and sauté for about 2 minutes until fragrant.
Add the pork to the pan with the vegetables and stir-fry it until lightly browned. Next, add in the bitter melon, eggplants, beans, and tomatoes. Stir-fry for another 2 minutes.
Pour the chicken broth, tomato paste, vinegar, and fish sauce. Simmer the mixture over low heat for 18-20 minutes until all the vegetables are cooked through.
Finally, add in the shrimp and simmer for another 3-4 minutes until they are cooked through. Serve the sari sari with steamed white rice.