This confection is chewier and denser than traditional American fudge. Edible silver leaf is available in baking and cake-decorating shops. We used aspic cutters to shape the fudge.
Spray a 8 1/2-by-4 1/2-by-2 1/2-inch loaf pan with cooking spray; set aside. Place bananas in a medium bowl, and mash with a fork until fairly smooth (or place in the bowl of a food processor and process). Set aside.
Heat 2 tablespoons ghee in a heavy, medium saucepan over medium-low heat. Add the bananas and sugar. Cook, stirring constantly with a wooden spoon, over medium-low heat until combined. Gradually drizzle in the remaining ghee while stirring until all the moisture evaporates. Stir the sides and corners of the pan as well as the bottom until mixture becomes sticky and brown, 10 to 15 minutes. Add the ginger and cinnamon, and continue to cook, stirring, until mixture is very thick and comes together to form a loose ball around the spoon, 10 to 20 minutes more. Transfer immediately to the prepared pan, and pat or spread out until even. Let cool to room temperature, about 2 hours. (Fudge may be made up to this point up to 1 day ahead -- but not longer or it will not cut neatly. Leave at room temperature.)
Loosen the edges of the fudge from the pan with a paring knife or small offset spatula. Turn out the fudge onto a parchment-lined work surface. Leave fudge as is, with smooth-side up. Working in a draft-free area, transfer silver leaf to the surface of the fudge by quickly turning the silver leaf over onto the fudge, with the paper on top. Rub gently with your fingers on the paper to help the silver leaf stick to the fudge. Peel off the paper; discard. Repeat with second sheet if needed.
Cut shapes from the fudge with teardrop cutters, or any small cutters. Fudge may also be cut in a diamond pattern or into squares, using a sharp kitchen knife. (If fudge is too soft to cut neatly, transfer to the refrigerator for 30 minutes to harden slightly.) Once cut, fudge is best eaten the same day.