Thoroughly clean the beef. Slice the beef into 1 by 3 inches long. Pat dry and set a side.
Heat olive oil in a sauce pan and sear the beef. Set a side.
Combine light soy sauce, oyster sauce, banana ketchup, sugar, peanut butter, water, calamansi juice, ground black pepper and garlic. Bring to a boil and simmer for 5 minutes. Remove the sauce form heat.
Add the beef into the sauce and marinate for 30 minutes.
Place a rack inside a pressure cooker and pour water until the rack is covered with water. Add the Italian seasoning and bring to a boil.
Place the marinated beef with the sauce in a metal bowl. Pressure cook for 45 minutes. Remove the meat from the sauce.
Heat olive oil in a sauce pan. Stir fry the beef until the sauce caramelized.