In a large bowl , stir together the flour , salt and sugar.
Chop the cold butter into small cubes , and Rub in the cold butter until the mixture is like bread crumbs. Basically , the butter should be in small bits all covered with flour.
Add the ice cold water one tablespoon at a time and mix until the mixture sticks together like a dough. There is no need to knead.
Shape into a disc. Cover and chill for atleast 30 minutes.
Stir together the cream cheese ,sugar , vanilla and corn flour until smooth. Keep this aside.
Slice up the jamuns into wedges. You can also roughly chop them up.
Mix in the sugar , corn flour ,lemon juice.
Preheat your oven to 180 c or 350 F .
Roll out the dough to a circle about 12 inches in diameter. Its easiest to do this on a piece of parchment .
Spread the cream cheese filling over the rolled out dough leaving an outer edge of about 2 inches of dough free all around
Place the jamun slices over the cream cheese layer and pour any remaining juices over. You can also just spread the jamun mixture using a spoon
Fold the edge ( where there is no filling )over the fillings .
Sprinkle some granulated sugar all over
Place the parchment on a baking sheet . Or transfer your galette carefully to a greased baking sheet
Bake at 180 C or 350 F for about 45 minutes until the dough top looks lightly browned.
Cool completely on wire rack