Take the skin off your bananas and break into small cubes. Freeze overnight (at least 8 hours).
Put banana, honey (if desired), and the vanilla essence in an s-blade style* food processor and blend. It will start off becoming flakey and clumpy. After around 1 minute it should start to combine and all of a sudden it will develop a creamy texture.
Sometimes the mixture sticks so it avoids the blades. Either chop the pieces smaller or stop the machine and push the lumps down into the blades. A couple of tablespoons of water can assist, however too much will make the mixture runny so add carefully.