Looks like a souffle?
From a box sold in East Moline, Illinois.
Lemon Cake Pudding
3/4 c. sugar
1 Tbsp. butter
2 Tbsp. flour
2 eggs
1 lemon and rind
1 c. milk
Combine sugar, butter, flour, egg yolks, lemon, and milk and mix well. Fold in stiffly beaten egg whites. Bake in pan [something?] 350 deg. 1 hour.
(6 servings.)
It says bake in pan of H2O (water).