Heat the oil in a large skillet.
Peel the bananas and cut them into pieces.
Fry the plantains in the hot oil until lightly browned, about 5 minutes.
With the bottom of a bottle or a small skillet, press the bananas until they are flat, about half their size, then shape them into a cup.
Fry the banana cups in the hot oil until golden brown then place them on a plate with napkins to drain the oil and sprinkle with a little salt.
In a heated skillet, add bell pepper, onion, and corned pork. Cook for 2-3 minutes. Remove and set aside.
Fill the plantain cups with the corned pork mix and top them with mayonnaise and ketchup if desired.