A simple egg wash can be brushed over the top of the crust to create a lovely golden color. Separate the white from the yolk of one egg, placing the white into a small bowl with high sides. Add water a teaspoon at a time, whisking well, until the egg white is light enough to be easily spread with a brush. Brush over the pie crust. For a deeper golden color and more shine, you can include the yolk as well.