Marinate the pork with soy sauce, pepper and calamansi juice for 2 hours or overnight as much as possible. Marinate the pork liver also with a small amount of soy sauce, calamansi juice and pepper for a few hours (this is optional).
Heat a pan and put 1 tablespoon of atchuete oil. Saute the red bell pepper for a minute. Set aside.
In the same pan, add more atchuete oil and fry the pork skin until crispy. Then add garlic and saute until fragrant. Add the onions and saute until soft.
Then put the sauteed ingredients on one side of the pan to give space on sauteing the liver. Add more oil if necessary. Saute the liver for a minute, remove from the pan and set aside.
In the same pan again, saute the tomatoes for one minute. Then put the pork and saute along with the pork skin, garlic and onions for 2 minutes. Add 1 cup of water, cover and simmer until half done, about 20 minutes. Add more water if necessary.
Afterwards add the raisins and garbanzos, stir for a few second. Follow the potatoes and bell pepper and stir. Simmer until the potatoes are almost tender.
Add in the liver and stir cook for about 2 minutes. Adjust the taste with salt and pepper if necessary.
Serve hot with steamed rice.