Peel, core and slice the apples thinly and as even as possible. If you have a mandolin, this is best, if not, you can do it by hand.
Organize the apple slices by size. Save longer slices for the exterior rim and the smaller pieces for the center rings. Any of the oddly shaped ends can be saved to use as a filler under the center rings, to keep those levels even.
In the chilled tart shell, add an even layer of apple sauce filling.
With one of the larger slices of apple, lay it on the apple sauce with the side of apple slice (not the tip) touching the edge of the tart shell. It should be slanted to about 30°. Continue adding apple slices, overlapping with the previous slice. Once you've finished the first layer, tuck the last apple under the first to create a continuous ring.
Add the odd bits and ends to the middle of the tart, then start with your second ring of apple slices, going in the opposite direction of the first. Continue until the entire tart is covered.
Bake at 180°c (350°F) for about 1 hour, or until all of the apples are cooked and edges are golden brown.
Warm up some apricot jelly or nappage blonde and brush a layer over the apples when the tart comes out of the oven.