1.Preheat the oven to 180C/160C fan/Gas mark 4 and line a 23 cm square pan with baking paper.
2.In a blender, blend the pistachio nuts, oats, and salt for about 30 seconds, until fine.
3.Pour in the maple syrup and olive oil while blending until the mixture forms a crumbly but moist dough.
4.Press the dough evenly into a baking tray and bake for 5 minutes. Remove from the oven and sprinkle the coconut flakes and remaining pistachios on top. Bake for a further 5 to 7 minutes until the coconut is lightly toasted and the dough is cooked through. The dough should still be fairly soft.
5.Once cooled, carefully lift the contents out of the tray by holding the baking paper. Cut it into 12 squares.
6.Store the squares in a sealed container (they will last at least a week in a cool, dry environment).