Add all of the pastry ingredients, except the water, to a food processor and blend until the mixture resembles breadcrumbs (approximately 20 seconds).
160 g plain flour, 30 g icing sugar, 20 g cocoa powder, 10 g ground almonds, 110 g dairy free butter
Add 1 tbsp cold water and blitz again briefly (approximately 10 seconds).
1 tbsp water
Take a small handful of the mixture and squeeze it together in your hand - if the mixture comes together into a ball then it’s ready, if not add another tsp of cold water and blend again before testing once more.
Remove the mixture from the food processor and bring it together into a ball. Press the ball down slightly to form a disc, wrap it in a reusable wrap or eco cling film and refrigerate it for 1 hour (or place it in the freezer for 30 minutes).Note: Chilling the dough before baking helps to prevent the butter from leaking out during baking.Making the pastry in advance: If you’re not ready to bake your pastry just yet, you can wrap the dough in eco cling film (or a reusable wrap / a sandwich bag) and either pop it in the fridge for up to 2 days, or freeze it for up to a month. If you have frozen your pastry, defrost it fully in the fridge for 24 hours before rolling it out and baking it. Spray a light coating of spray oil onto a non stick metal tart pan with a removable base (20cm / 8”). The spray oil helps to prevent the pastry from sticking to the pan and makes it easier to remove once it’s baked.
Once the pastry has chilled, transfer the dough to a lightly floured smooth surface. Knead the dough briefly for a couple of seconds to make it easier to roll out (but don’t over-work it).
Roll the dough out using a rolling pin, until it is around 2mm thick (1/4 cm or 1/8").
Transfer the pastry to the tart tin. Tip: To do this we like to roll the pastry gently around our rolling pin. We can then transfer it to the tart tin whilst holding it wrapped around the rolling pin.Note: If you’ve had any mishaps along the way, don’t worry, this pastry is forgiving - just patch it up as necessary, pressing spare pastry gently into any holes. Lightly prick the base of the pastry case with a fork.
Bake the pastry case at 150°C fan (170°C conventional / 325°F / gas mark 3) for around 15 minutes, or until the base feels dry to the touch.Tip: For an extra neat finish, line the pastry case with parchment paper and then fill it with dried beans or rice before baking. This will prevent the pastry from puffing up. It will likely take a few minutes longer to bake than an unfilled pastry case - carefully lift the parchment paper up off the pastry and look at the centre of the tart, if the pastry looks dark/damp, it needs a few more minutes.