Cut off both ends from the plantain, then use the tip of your knife to cut a slit down the back.
Using your two thumbs, remove the peel from the plantain and discard the peel.
Once you’ve peeled all the plantains, slice each one in half down the length.
Separate the two halves and flip them onto their flat sides to create a stable base.
Place your palm flat on top of the plantain, and use a sharp knife to slice parallel to the cutting board and cut the plantains into 1/4-inch thick slices; set aside. Alternatively, use a mandolin to slice the plantains thinly, but be careful because the plantains are softand the mandolin is sharp.