Old-Fashioned Lemon Filling Cake
["1 c. sugar", "1 large can cream", "6 Tbsp. lemon juice", "2 heaping Tbsp. flour", "3 egg yolks, beaten"]
["Cook over low fire until thickens.", "Use on cake of your choice."]
["sugar", "cream", "lemon juice", "flour", "egg yolks"]