Slice the peeled plantains diagonally into 1" slices
Fry the slices over medium heat until they soften
Remove from oil and drain on paper towels
Using a tostonera (a press), slightly mash each piece to about half an inch in thickness. If a tostonera is not available insert the pieces between a folded piece of brown-paper sack and press down using a saucer
It is best to press all the pieces first before going on the next step
Dip each piece in warm salted water and fry again until crispy
Remove from the oil and drain on paper towels
Salt them
Video
Notes
Tostones may be served with mayo ketchup or with garlic sauce.