Preheat oven to 375 °F (190 °C ).
If you are using fresh cherries, clean them and remove the seed. If using jarred - drain the liquid and if using frozen - do not thaw them.
In a bowl, using a hand mixer mix 4 eggs with 3/4cup (150 g; 5.3 oz) sugar, until thick and pale, add salt and lemon zest.
In a separate bowl mix flour and baking powder.
Add softened butter to egg mixture, and mix until smooth. Stir in flour and baking powder, mix until smooth and lump free.
Pour batter into greased pan (9x13 inch, 22x32cm) and bake for around 7 minutes.
In the meantime, mix the sour cream with the remaining sugar, eggs, vanilla extract and corn starch.
Remove the cake from the oven, spread cherries all over the batter, and pour a sour cream mixture over the cherries.
Return to the oven for another 25-30 minutes, or until a toothpick inserted into the center come out clean.
Cool to room temperature and dust with icing sugar.