1. Sift flour, salt, and sugar together.  With a pastry cutter, your hands, or a food processor, mix in 6 tablespoons of butter until the mixture looks like thick sand.  Mix in the water until dough forms.  On a lightly floured surface, knead dough quickly.  Wrap in plastic wrap and chill for 1 hour.

2. Preheat the oven to 400 degrees F.

3. When the dough is ready, roll into a 12 inch wide circle.  Place dough on a sheet pan and chill while preparing the apples.  Peel and core the apple.  Cut in half from the stem then slice apples crosswise into 1/8 inch thick pieces.  Arrange the apples in a circular pattern.  Sprinkle the sugar and small butter pieces over the apples.  Bake for 45 minutes or until edges of dough and apples are brown.

4. When done, heat the jam and water together and brush over the apples.  Serve warm or at room temperature.