Tin size: 35cm length x13cm width x 2.5cm height – loose bottomed (if not using loose bottomed, pleaseadd baking paper to the tin before adding the base to allow for easy removal ofthe tart after baking).
Place the walnuts into a food processor and pulse until finely chopped.
Add the ground almonds, buckwheat flour, butter(or vegan spread), xylitol and salt. Pulse until the mixture resembles bread crumbs.
Next, add the beaten egg (or ground flax seeds) and a splash of ice-cold water and pulse a couple of times, just until the mixture comes together.
The mixture will still be a little crumbly at this point but turn out the mixture onto a floured surface and knead gently until it comes together a bit more. Then wrap in clingfilm and leave to chill land rest in the fridge for about 30-60mins.
Place the chilled pastry onto a clean board, dusted with flour and use a rolling pin to gently roll out the pastry to a length on width to fit your baking tin, with enough to leave some to go up the sides of the tin.
Gently transfer the pastry into the baking tin and use your clean fingers to press into the shape of the tin. Using a fork, prick all over.
Place the tin into the fridge for 30mins to set. This will prevent the pastry from shrinking during cooking.
After chilling, place a sheet of baking paper over the pastry and then add some baking beans or some uncooked, dry rice to weigh the baking paper down. Bake the pastry in a pre-heated oven at 180 degrees C for 10 minutes.
Remove from the oven ready for adding the filling ingredients.