For the crust

1. Put the flour, ground almonds, and powdered sugar into the bowl of your food processor and pulse to combine and work out any lumps. Add your cold butter chunks and pulse until the butter is incorporated. It may look a bit like wet sand.
2. Beat together the egg, salt, and 3 tablespoons ice water. With your food processor running, slowly add this mixture down the chute. Process your mixture until it just starts to come together. You may need to add a bit more ice water to make this happen.
3. Turn your dough out onto some plastic wrap. Give it a bit of a smoosh to make it all come together, then shape it into a disc, wrap it tightly, and stash it in the fridge while you make the filling. You can make the dough the night before if you wish.

For the filling

1. Preheat your oven to 400F (200C) and dig out your 10 inch tart pan with a removable bottom.
2. Melt your butter and let it cool slightly.
3. In a large mixing bowl, whisk together sugar, eggs, and zest. Add melted butter and whisk to combine. Finally, mix in the ground almonds.
4. Roll out your dough to fit your tart pan. Lay the dough in and trim the edges. Prick the dough all over with a fork.
5. Spread the cranberry sauce over the bottom of the the tart. I didn't measure. I just spooned and spread.
6. Next pour the the filling into the pan and gently spread it evenly making sure it goes all the way the edge and covers all the jam.
7. Bake for 40-45 minutes. It will be brown and puffy when you take it out of the oven (hopefully not as brown as mine was), but will flatten out as it cools.
8. Allow your tart to cool completely before icing.

For the icing

1. Put the egg white powder and warm water into a mixing bowl and beat with an electric mixer until it becomes foamy and eventually forms soft peaks. Add the powdered sugar and clementine juice and mix until it comes together. You may need to add more water or orange juice to get the right consistency. You want this to be thick but not pasty.
2. Spread the icing onto your tart. Add cute little decorations if you got 'em.