Preheat an oven to 400°F (200°C). Place the pastry on a floured surface, roll out into a circle about 16-by-18-inch and 1/16 to 1/8 inch thick. Spread 1 tablespoon of peach or plum jam all around. Transfer the crust in the well greased and floured circular pie pan, or line the pan with a parchment paper. Spread evenly Strawberry or Raspberry jam. Scatter a spoon of the flour and sugar over the rolled out pastry, leaving a border of about 3-4 inches all around the edge - This will help, so your galette bottom won't become soggy during baking and the game will give a nice flavor, and sweetness.