Beat butter or margarine with an electric mixer.
Add eggs and sugar. Beat for 4 to 5 minutes.
Mix flour and farina and add to mixture.
Add vanilla extract, lemon zest, and baking powder.
Pour batter into a 10x14 pan and bake for 45 minutes at 200 degrees in oven or until golden brown.
Remove ravani from oven and immediately cut it into strips of two inches in width.
Boil sugar, water and lemon juice for 5 minutes to make the syrup.
Pour cool syrup all over hot ravani.
Cover ravani with a towel and let it stay overnight.
When ready to serve, cut ravani into diamond shapes and decorate with roasted slivered almonds.
