Add milk to pot and as soon as it starts boiling add Farina.stir till it starts to thicken and remove from heat, and stir until cool.mix eggs, sugar, vanilla,lemon juice and beat until fluffy. add ricotta cheese and continue beating until totaly incorporated. grease a 9x13 cake pan with butter. pour mixture in pan and bake at 350f for about 45 minutes or until top browns.toothpick method should be fairly clean but a little wet is ok as cake will gell as it cools. once cool cover with tin foil and leave in refrigerator over night. dust with confection sugar.