Last week I made these bars and added lemon zest from 2 lemons and the juice of one of the lemons. It boosted the lemony flavor nicely.
Gladygirl: I also bought the angel food cake mix that had two pouches in it. Although, I did not add water to the egg white pouch, I just dumped both in the bowl and mixed it with the lemon pie filling. It was not as tasty and was much denser so I will stick with the Betty Crocker angel food mix.