Clean the tripe thoroughly under running water. Fill a large pot with 8 cups of water and add the tripe, 1 tablespoon salt, bay leaves, and whole peppercorns. Bring to a boil, then lower heat and simmer for about 1.5 hours or until the tripe is tender. Once done, save 2 cups of the broth and drain the tripe. Let it cool, then cut into thin strips.
While waiting for the tripe to cool, prepare your other ingredients: Cut the liver and heart into thin strips. Julienne the pineapple, bamboo shoots, and carrots. Chop the onion, mince the garlic, and julienne the ginger. Slice the bell pepper and chilies.
Heat oil in a large wok or deep pan over medium heat. Add garlic and cook until light golden, about 1 minute. Add ginger and onion, cooking until the onion becomes clear and soft, about 2-3 minutes.
Add the julienned tripe, liver, and heart to the pan. Stir-fry for 5 minutes. Add the pineapple, carrots, and bamboo shoots, then pour in the fish sauce. Cook everything together for 3-5 minutes, stirring occasionally.
Pour in the 2 cups of reserved broth and add the sampaloc mix if using. Let it come to a boil, then reduce heat and simmer for 8-10 minutes until the liquid reduces by half.
Add the chilies and bell pepper. Season with salt and pepper to taste. Simmer for a final 3 minutes.
Serve hot with steamed rice. For extra flavor, serve with calamansi on the side.
For the best taste, let the dish rest for 5 minutes before serving to allow the flavors to settle. The sauce should be slightly thick and coat the ingredients well. If it's too watery, simmer for a few more minutes. If too dry, add a splash of the reserved broth.