A classic French plum tart, made healthier by choosing better-for-you ingredients, and less sugar!
To make the dough, whisk the flours and sugar together in a large bowl. Then add the cold butter cubes, and using a dough cutter or 2 regular butter knives, cut the butter into the flour mixture in a criss-cross manner, until it is coarsely mixed. In a small bowl, whisk the egg and the water, then add to the flour mixture. At first you can mix it using the dough maker, but it gets tricky, so you'll most likely need to use your hands at the end (wash your hands first!). You don't want to mix the dough too long. Make a ball out of it and wrap it in plastic film. Put in the fridge to cool down (at least 10 minutes, but no more than 30 minutes, otherwise it'll get too hard to roll out).
Wash all your plums well, cut in half and gently twist to separate, remove the pit and then cut in half again, so you end up with 4 quarters per plum (leave the skin on). If your plums are extra-large, cut each quarter in half again, so you sendup with 8 slices per plum. Put the cut plums in a bowl, sprinkle 1-2 Tbsp of sugar on top and mix well to coat.
Get your dough out of the fridge. It's easier if you use a sheet of (unbleached) parchment paper with flour on it or the plastic film that you wrapped it in. Put the dough on top and add another sheet of parchment paper on top and start pressing down a bit with your hands, then use a rolling pin or a clean wine bottle. Always roll from the inside of the dough to the outer edges. You should have enough dough to make at least a 12-13" diameter crust. You don't want the dough to be too thin, but not too thick either. I used a 10" ceramic pie dish.
Pre-heat the oven to 350 F/180 C.
Using your fingers, rub some butter all over your pie dish, then sprinkle some flour (that will stop the pie from sticking to the dish). Gently, but quickly, fold the rolled-out dough in half, and then in half again. Gently lift and put it in the pie dish and unfold without waiting. You can carefully push the dough to the bottom, making sure not to break it. If you do, try to patch it, using your fingers. Fold the extra dough on the edges (no point in wasting any of that yummy dough). Using a fork, prick the bottom of the dough and put in a pre-heated oven at 350 F/180 C for 10 minutes.
Next, using a clean coffee grinder, you'll want to grind your raw almonds (1/3 cup whole almonds should give you almost 1/2 cup once it's ground). In a medium-size bowl, mix all the ingredients for the cream filling: egg, melted butter, sugar, ground almonds and almond butter. I used a whisk to make sure everything was smooth.
Remove the pre-baked dough from the oven and pour the egg/almond mixture in. Add all the plum quarters/slices on top, as close together as you can. Sprinkle extra sugar on top if you wish (optional). Bake in oven at 350 F/180 C for 35-45 minutes, until cooked and the crust is golden brown.
Can be served warm or cold. I couldn't wait to eat mine so I had a piece right out of the oven with a nice scoop of organic vanilla ice cream.
Depending on the size of the plums you use, you might need 4 extra-large ones or 7 regular size ones.