In a kneading bowl mix the wine,oil,sugar,both types of flour and baking powder.Knead the dough.On a lightly floured surface roll the dough to 0,5cm thickness and cut into squares.On one side put some jam and fold to get a triangle.Press the edges with a fork to seal.Bake for 10'.The cookies should stay light in color but the bottom will be lightly brownish.Roll immediately in a powdered sugar mix with vanilla sugar.