Here's an easy recipe I like. Not sure if it's what you had in mind, but the top makes its own crispy part. Very refreshing and light.
3/4 cup sugar
1/4 cup all-purpose flour
3 tablespoons butter, melted
1-1/2 teaspoons finely shredded lemon peel
1/4 cup lemon juice
3 beaten egg yolks
1-1/2 cups milk
3 egg whites
Combine sugar, flour, and salt. Stir in butter, lemon peel, and juice.
Combine egg yolks and milk. Stir into flour mixture.
Beat egg whites to stiff peaks. Gntly fold into batter.
Turn into 8 inch baking pan. Place into larger pan, filled with water to a depth of one inch.
Bake at 350 degrees 35 to 40 minutes.
at 4:10 PM on Mar. 30, 2013