Combine the mince, chutney, curry powder, apple and onion in a large bowl and mix all ingredients through evenly. Lay one sheet of pastry on a floured surface to thaw for a minute or so, spread it with 1/3 of the mixture, leaving a 2cm border around the edge. Roll up like a Swiss roll (make sure the pastry is thawed or it may crack), brushing the edge with egg white to seal. Brush the completed roll with egg white and use a serrated knife to cut the roll into 1cm slices. Repeat for the other 2 sheets of pastry and remaining mixture. Place pinwheels on a lightly greased oven tray and bake at 375° for about 20 minutes, or until pastry is golden brown.
To freeze, cool for a minute or so, then remove with a spatula (may stick to the tray a little during cooking) and cool completely on a cake rack. Place on a tray in single layers separated by sheets of greaseproof paper, cover tightly with plastic and seal all in a plastic bag before placing in the freezer. To reheat, transfer back to oven tray thaw for ½ hour heat in oven for 5 minutes and serve