Step 1

Preheat oven to 350˚F. Set aside a 10 - 12 inch tart pan.

Step 2

In a large bowl toss rhubarb with sugar, lemon juice and zest. Spread on a baking sheet and bake for 20 minutes until soft when pierced with a knife, let cool.

Step 3

Meanwhile, in a food processor add flour, ground almond flour, sugar, baking powder and salt, pulse to mix. Add cubed butter and pulse until the mixture resembles fine bread crumbs, add the egg and pulse until combined (this can also be done in a bowl with a pastry blender or two knives). Gather the pastry together and shape to form a flat disc; wrap in plastic wrap and chill in the fridge for 20- 30 minutes.

Step 4

Prepare a 10 - 12 " tart pan with a removable bottom. Set aside.

Step 5

Roll out chilled pastry on a floured work surface, about 2 inches larger than your tart pan (if you are having troubles with your dough, you need to chill it longer).

Step 6

Place the pastry into your pan and press dough in place. Cut off any extra pastry at the top and using a fork prick pastry all over. Put it back in the fridge and chill for another 20 minutes.

Step 7

Line the pastry with parchment paper and fill with baking weights (beans or uncooked rice), bake blind for 15 minutes at 350˚F. Remove weights/beans.

Step 8

Meanwhile, beat butter and sugar together until light and fluffy, add eggs one at a time and almond extract. Add almond flour, flour, baking powder and salt. Mix together until well incorporated (Note: the filling will be thick so don't worry).

Step 9

Take about 7-8 rhubarb stalks and set aside, this will be to top the cake with. Take the rest of the rhubarb and cut into small pieces and mash it with a fork.

Step 10

Spread the mashed rhubarb over the entire base of the tart. Then fill the tart with almond mixture and carefully spread evenly. Arrange the rest of the rhubarb on top either in a star shape or in rows. See images above for a reference.

Step 11

Bake in the oven for 35-40 minutes until golden, puffed and the centre is baked through.

Step 12

Cool in the tart pan. When cooled remove from the pan by pushing it out from the bottom. Sprinkle the top with icing sugar.