Sieve the flour into a mixing bowl. Add the butter, parmesan and oregano and rub into the flour until it resembles breadcrumbs.
Add the egg yolk and the water and mix to form a dough. Wrap the dough in cling film and allow to rest in the fridge for 30 minutes.
Roll out the pastry on a floured surface slightly larger than the tin. Line the tin with the pastry and trim the edges. Place a circle of baking paper over the pastry and fill with baking beans.
Transfer to the oven and bake for 8 minutes. Remove the beans and paper and return to the oven for five minutes.
For the filling, place all the ingredients (except for the goat’s cheese) into a large bowl and mix gently.
Pour the filling into the pastry case and sprinkle the goat’s cheese on top.
Bake the quiche for 20 - 25 minutes, or until the filling is set. Serve warm or cold with a green salad.