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Prepare the cherries and toss with the sugar, cornflour and almond extract until well coated. Set aside for now.
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Make the pastry base - rub the butter into the flour then add enough cold water to bring it together to a crumbly dough. Tip onto a piece of cling film and bring together into a flat disk and chill in the fridge until the butter has solidified again. About 30 minutes will do.
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Preheat the oven to 180˚C and position a shelf no higher than half way up.
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Roll the pastry out big enough to lie a 9 inch pie plate then scoop in the cherries and any juices released.
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Mix the flour, sugar and vanilla seeds together then spoon over the cherries reasonably evenly. A little bit of exposed fruit is no bad thing.
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Lay the sliced butter over the top of the pie aiming to cover as much as possible - you will need to slice it no more than 2mm thick to do so.
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Bake for 55-60 minutes until the pastry has browned around the edges and the butter will have absorbed into the floury top and browned it. It will be a little patchy but that's part of it's charm.
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Cool for at least 15 minutes to make slicing easier.