These are twice-fried plantain slices. These are also known as tachinos or chatinos, fritos verdes, bananes pesees, and patacones. Unripe plantains are used for the dish. They are peeled and sliced (length-wise, diagonally, or width-wise), and fried twice in butter. They become golden in color, then flattened with a special hinged utensil, called tostonera, and fried again. They are eaten with salt, like potato chips.