Whisk together the egg, and egg yolk in a small bowl. Pour this into the flour mixture and use a fork to blend until everything is starting to come together. Switch to your hands to bring the dough together in the bowl. On a dry day (winter heat) or if using a gluten free flour blend, you may need a bit more moisture to help this happen, so add a little water at a time as needed.
Transfer to a clean counter and continue folding until it is smooth and well blended. Divide into the sections, about two thirds, and one third. Shape into flat disks and wrap well with plastic wrap. Place in the fridge for at least 30 minutes to rest. This can be even made the day before.
Preheat oven to 350F or 180°C. Position an oven rack in the lowest shelf of the oven. Roll out two-thirds of the pastry on a lightly floured surface to a 5mm (1/4 inch)-thick disc.
Line a 23cm (9 inch) fluted tart tin (the sides should be 3.5cm or 1 1/4 inches high, SEE NOTES), with removable base, with the pastry. Ensure that you go up and past the side edges. Don't stretch it too thin. Trim excess.
The exposed pastry along the top edge should be about 1 cm or 3/8 inch wide. If pastry breaks apart as you bring it to the tart pan, no worries, patching is a breeze.
Heat the jam in a small saucepan over medium heat for 1-2 minutes or until softened and runny. Set aside for 3 minutes to cool slightly. Pour the ricotta filling into the pastry shell. Don't go higher than half way up, especially if your tart shell doesn't have the required dimensions. Spoon the jam evenly over the surface.
This tart needs to be baked in a 9 inch tart shell with a removable bottom. The sides should be 3.5 cm or 1 1/4 inches high. If your tart shell has lower sides, don't fill the ricotta portion more than halfway up.
Feel free to replace the orange zest with lemon or even lime zest. The lemon will work with most jams and preserves, and the lime works especially well with strawberry preserves!
Use the Seville Orange Marmalade found in The Lemon Apron Cookbook. You can also replace this with the jam or preserves of your choice.