Heat the butter and and add the sugar, honey and salt. When the sugar dissolves, add the sliced apple and allow to soften. Now add the cinnamon, nutmeg and ginger powder. Mix well. By now the filling should be almost dry and ready. Aloow to cool.
Assembling The Tarts:
Roll out the puff pastry into a long rectangle and cut it into smaller rectangles measuring 4u201d by 3 u201c. Cut each rectangle into half. In the picture below you can see three 4 by 3 rectangles cut into half.
From one of these, cut out and remove a smaller rectangle from the centre (see picture below).
Now place this rectangle with the hole exactly on the other half and press down on sides to ensure that it is stuck to it.
In the small hollow put a bit of the apple filling. Repeat this with all the other rectangles.
Bake at 220C (430F) for about 20 minutes or till golden brown. Serve while still slightly warm or cold.
(This is what the tarts look like if the two rectangles are not pressed together well enough. They look a bit weird but still taste great.)