Mix the flour, sugar and salt in a bowl. Add the butter and rub together using your hands to form an even, crumbly mixture. Add the water, mix quickly to create a soft dough, do not knead, cover and refrigerate for approx. 30 mins.
Mix the berries, syrup and lemon juice.
Divide the dough into 8 portions. On a lightly floured surface, roll out the pieces of dough into circles (approx. 15 cm in diameter). Drain the berries, place in the middle of the pieces of dough. Fold the edges inwards, making sure the filling can still be seen. Brush the folded edges with the drained berry juice, sprinkle with almonds. Place the galettes on a baking tray lined with baking paper.
Approx. 30 mins. in the lower half of an oven preheated to 220°C. Remove from the oven, transfer to a cooling rack and leave to cool.