Preheat the oven to 180C
To make the white sauce, pour the milk in a saucepan together with the nutmeg and bring it to the boil
Meanwhile, melt the butter in another pan, add the flour and salt and mix well; stir in the milk and parmesan and mix well; let it cool to room temperature
Butter a 23cm shallow cake tin; roll out the pastry and line the pan, trimming the edge if necessary; prick the base with a fork
Beat the eggs and add to the milk and flour mixture and mix well; pour onto the base of the pie; peel the carrots and using a potato peeler, cut the zucchini, aubergine and carrots lengthways, into ribbons
Decorate the pie with the vegetable ribbons by placing them in circles all-round the pastry, until the base is covered; brush with the oil and season to taste
Bake in the pre-heated oven for 50/60 minutes; allow to cool and then cut into slices and serve
6 servings