A side note, since raw egg can be a health risk (not that much to worry about, but it never hurts to be safe), I usually cook the egg yolk. Take the yolk and sugar and mix in the top half of a double boiler (or, use a stainless steal bowl that will sit on top of a saucepan). Bring water to a boil and put yolk mixture over. Once water is at a boil, turn heat to low and cook for 10 minutes, stirring constantly. After 10 minutes, remove from heat, and whip for several minutes until slightly cooled. Then mix in the cheese, etc.

Also, I like to use whipped heavy cream instead of egg white, I think it makes it a tad bit richer and lighter, but that could just be me.