In a pressure cooker, add ox tripe, ginger, salt, and enough water to cover the meat. Pressure cook for 20 to 30 minutes.
Turn off the heat and carefully release pressure. Remove ox tripe and reserve 4 cups of the broth.
In a pot over medium heat, add beef liver and enough water to cover beef liver. Cook for about 1 to 2 minutes or until half-done.
Remove beef liver from the pan and cut into cubes. Set aside.
Cut ox tripe into cubes. Set aside.
In another pot over medium heat, add canola oil. Add onions and garlic. Cook until softened.
Add cooked ox tripe, calamansi juice, Thai chili peppers, and fish sauce. Cook for about 1 to 2 minutes.
Add reserved broth and bring to a boil.
Add cooked liver and cook for about 1 to 2 minutes.
Add green chili peppers, 4 pieces of whole calamansi, and salt.
Lower heat, cover, and simmer until broth is bitter. Cook for 3 to 5 minutes.