BUCKWHEAT + RHUBARB TART
'La tarte à la rhubarbe' may or may not be a French institution. Alsatian versions include a soft meringue on top and a flan, infused with orange zest. I love the one from Christophe Felder. Other rhubarb tart influences for this recipe include Aran Goyoaga for the buckwheat dough (her version is gluten free - not this one!) and Clotilde Dusoulier for the maceration juices (that she adds to an egg custard). Sometimes I also make a quick custard or use a frangipane as a rhubarb bed but I wanted this version to be more simple and quite tart. Because that's what rhubarb is all about. So I added lemon, and a layer of almond meal which becomes soft thanks to the rhubarb juices - it's almost like a frangipane but without the extra butter.
serves 6
buckwheat dough
butter, unsalted, cold, diced - 113g
all purpose flour (T55) - 110g
buckwheat flour - 40g
spelt flour - 30g
light brown sugar - 65g
sea salt - ¼ teaspoon
vanilla powder - one teaspoon
vanilla extract - one teaspoon
egg yolk - one
water - 1-2 tablespoons
rhubarb & almond filling
rhubarb - 300g
sugar - 60g
one lemon - zest and juice
almond meal - 150g
egg white - one
extra sugar - to sprinkle
finishing touch
raspberries - 100g
the juice from the rhubarb maceration
the juice of another lemon
Start with the filling: cut the rhubarb in dice, add the lemon zest and juice as well as the sugar - mix with your hands to coat the rhubarb with the sweet syrup and leave to macerate for 1-3 hours.
To make the dough, crumble the flours and the butter together with your hands. Add the sea salt, vanilla powder (or seeds from a bean). Whisk an egg yolk with one to two tablespoons of water - depending on how dry the dough feels. Once it comes into a ball, wrap with cling film and transfer to the fridge or freezer for 1-3 hour (overnight also works).
Preheat the oven to 200°C / 390F. Bring out the dough from the fridge and roll it out on parchment paper, add the almond meal to cover the middle of the dough - it will soak up the rhubarb juices as it bakes. Gather the rhubarb in the center of the tart over the almond meal - save the juice for later. Sprinkle a tablespoon of sugar on top of the rhubarb. Bring the sides of the dough to the center, and brush the edges of the crust with the egg white before sprinkling a little bit of sugar.
Bake for 35-40 minutes - until golden. The rhubarb should be soft to the touch, the crust lightly brown. While the tart is baking, take a saucepan, add the juice of a lemon to the maceration juice and bring to the boil for a few minutes until it becomes a light syrup.
Remove the tart from the oven, add the fresh raspberries and gently drizzle with the rhubarb syrup.