Begin by stirring the dried fruit, chopped apple and brown sugar together in a bowl. Set aside.
Cut the pastry in half, and roll out the first half on a sheet of waxed (greaseproof) or parchment paper thinly (about ⅛") into a rectangle to line the bottom of a 9"x13" baking pan (about 11" x 15"). Trim the rough edges.
Add the filling into the pastry lined pan.
Roll out the other half of the pastry to cover the top. Wet the edge of the bottom pastry, then carefully lift the second pastry layer and place on top of the fruit. Press edges together to seal.
Lightly mark the top into squares or slices, then brush the top with the beaten egg and sprinkle the caster/Baker's Sugar over the top. Bake near the middle of the oven for about 30 minutes or until golden brown.
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