Make the Dough:
In a large mixing bowl, combine flour, salt, and sugar. Add the cold, diced butter and cut it into the flour using a pastry cutter or your fingers until the mixture resembles coarse crumbs. Gradually add ice water, one tablespoon at a time, mixing until the dough just comes together. Form the dough into a disc, wrap it in plastic wrap, and chill for 30 minutes.
Preheat and Prepare:
Preheat your oven to 375°F (190°C). Roll out the chilled dough on a floured surface into a 12-inch circle. Transfer the dough to a parchment-lined baking sheet.
Add the Jam:
Spread the fruit jam evenly over the center of the dough, leaving a 2-inch border around the edges. Fold the edges of the dough over the jam, pleating as you go, to create a rustic crust.
Egg Wash and Sprinkle:
In a small bowl, beat the egg and brush it over the crust. Sprinkle the crust with coarse sugar for added texture and sweetness.
Bake:
Bake for 30-35 minutes or until the crust is golden brown and the jam is bubbling. Let cool for 10 minutes before serving. Enjoy warm or at room temperature.
