The shortbread crust can be substituted with your favorite double-crust pastry.
Look for a Freestone peach or other cling-free peach variety as they will be easy to remove their pits.
The lemon juice will prevent the peach slices from discoloring.
Consider leaving the peaches unpeeled, their rosy peels will make a beautiful version of this tart.
Alternative to scalding the peaches you can peel them with a vegetable peeler.
After filling the tart crust with the custard, place strips of foil on the edge of the crust to prevent over-browning.