Certainly on the pie side of cake.
from the April 23, 1936 edition of the Middlesboro (Kentucky) Daily News.
From the box of D.W. from Cedar Falls, Iowa.
Lemon Cake Pie
5 T. flour
1 c. sugar
2 egg yolks
2 T. melted butter
Grated rind of 1 lemon
Beat 3 minutes and add 1 c. milk, and fold in egg whites which have been beaten stiff. Bake in unbaked shell, 350 deg. for 40 min.