Peel plantain and cut into 1-inch slices. Fill a bowl with 3 cups of cold water.

Heat oil in a large deep skillet over medium-high heat; add plantain slices in an even layer and fry on both sides until golden brown, about 3 1/2 minutes per side. Set skillet aside.

Transfer plantain slices to a chopping board; flatten each one by placing a small plate on top and pressing down.

Dip plantain slices in cold water.

Reheat oil in the skillet over medium heat; cook plantain slices for 1 minute on each side.

Season to taste with salt and serve immediately.