Allow at least half a plantain per person. Leaving the skin on, cut them in half, and put them into a pan of cold water. Bring them to a boil. It should take about 15 minutes of boiling to get them to the proper degree of softness.
Drain them, cool them, and cut the two halves of each in two again.
Gently press them flat and sauté them in hot butter.
Drain on paper towel and serve. If you want, you can sprinkle them with confectioners' sugar or drizzle them with honey.