Peel and slice plantains into large pieces.
Heat a skillet with enough oil for deep frying. Fry the plantain slices about 2-3 minutes until they just start to turn golden.
Remove onto paper towels.
In a medium bowl, combine water, vinegar and salt.
Transfer the plantain slices in vinegar solution for about 1-2 minutes.
For the next step, you can use the flat side of a large knife like a cleaver or wrap a heavy pan (cast iron) in foil and use the bottom of the pot. You can also use a tostonera or a tortilla press.
Place the fried plantain slices in the tostonera and lightly press down. Alternatively, place the fried plantain slices on a chopping board and with the cleaver or the cast iron pot, press down until the fried plantain slice is flattened.
Fry again in the hot oil for a few minutes on both sides, until golden brown and crispy.
As soon as it comes out of the hot oil, give it a scant sprinkle of salt and place on paper towels to absorb excess oil.
Serve with every Haitian meal!