Arrange all of the ingredients on a tray, with the ice cream resting on a bed of ice so it will not melt during the preparation.
Melt the butter in a sauté pan or the skillet of the guéridon. Add the brown sugar and stir until the sugar is melted. Add the banana liqueur and the cut banana halves, placing them cut-side down in the pan. Cook, shaking the pan, sti