If you wish you could use the remaining half egg to brush over pastry case before baking. I used half wholemeal / half white flour and glazed with a simple sugar syrup. For syrup boil up 2 teaspoons water, 2 teaspoons sugar and a pinch of mixed spice- microwave 1 min will usually do. Then brush over the pie. This pie is quite moist, but will slice up without falling apart. If you use less ripe bananas then you could add a tablespoon milk to slacken sponge mix.