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Mix all the ingredients for the dough together, adding more liquid/flour if required, and knead it all until it’s reasonably smooth. Put the dough in the fridge for an hour before you need to use it.
Add the ingredients for the filling into a blender and blend, or mash by hand using a potato masher.
Preheat the oven to 200°C. Divide the pastry in two. Roll out the first part and cut out an oval shape.
Place the fish on a baking tray with toasted breadcrumbs sprinkled on the dough.
Put the apple filling on to the oval, roll and cut out a second oval and place over the filling, pressing the top layer to the bottom.
Cut out an eye hole and a hole near where the tail will go. Add fins, gills, scales. Bake for 45mins.