Mix butter with powdered sugar and lemon juice, add eggs, flour, baking powder, almonds and cinnamon, stir up.

Pour the batter in a mold and bake for 10 minutes, then reduce the heat until 355°F and bake for additional 25 minutes. Cool.

To prepare the syrup, mix powdered sugar with juices and water. Bring the mixture to boil, reduce the heat and cook through for 10-15 minutes.

Put the pie on a plate, pour with prepared syrup and season with orange zest.