Goat's cheese, leek & hazelnut super-smart tart!

Now there are some tarts that are nice but dull - and some tarts that are surprisingly delicious.  This is one of the latter. I liked the idea of this tart for more than one reason. First of all, I really like leeks - they're the only one of the onion family that I can eat without experiencing some severe regret in the tummy department, later on.  I particularly like the way th