Place the sugar and orange zest in a bowl and using your finger tips, massage them together.
Add the ricotta cheese and vanilla extract and whisk to combine.
Whisk in the 1 whole egg and egg yolk.
Next whisk in the rice custard 1/3 at a time. Whisking until each addition is completely mixed in.
Remove the lined tart pan from the fridge and fill with the filling and smooth with an offset spatula.
Combine the remaining 1/3 of dough with any leftover scraps from the bottom crust. Roll it into a rectangle 1/8” thick and approximately 9'“ x 10”.
Cut 10 strips 3/4” wide. Place strips in a lattice pattern.
Bake in a 350 degree oven for 35-40 minutes or until the crust is a light golden brown and the filling is set.
Let the tart cool on a rack for 10 minutes, then remove the sides and allow to cool completely.