Sift flour once, measure, add baking powder and salt, and sift together three times. Beat eggs with rotary egg beater until thick enough to stand up in soft peaks. (5-7 minutes); add sugar gradually, beating constantly. Add lemon juice. Fold in flour, a small amount at a time. Add hot milk and stir quickly until thoroughly blended. Turn at once into ungreased tube pan and bake in moderate oven (350 degrees F.) 35 minutes or until done. Remove from oven and invert pan 1 hour or until cold. Remove form pan, Pile Strawberry Fluff Topping on top of cake.