Vegetable Pastitsio

I  made this pasta dish last night after a bit of a scrabble around in the fridge. I had some vegetables lying around in the salad tray and was thinking of making some minestrone soup. But nobody wanted soup! I also had some bits of cheese - mozarella, gorgonzola and a tub of half used marscapone from the weekend. So I decided maybe some pasta was in order. So... here is my recipe which I think is rather good.

3 red onions peeled and cut into half moons
3 leeks washed and cut into 1 inch slices
3 courgettes cut into 1 inch chunks
2 bulbs of fennel - trimmed and quartered
1x500g punnet of cherry tomatoes
olive oil
fresh thyme and rosemary sprigs
salt and pepper
500g penne pasta
6 slices prosciutto cut into strips
2 tablespoons marscarpone cheese
6 oz buffalo mozarella torn into chunks
6 oz gorgonzola in chunks

Preheat the oven to Gas 7/200 degrees centigrade.

Place all the prepared vegetables in large roasting tin and sprinkle with about 3 tablespoons of olive oil to lubricate all the vegetables well. Season with salt and pepper and add the fresh thyme and rosemary sprigs.
Place the tray of vegetables in the oven and roast for about 30 minutes until soft.
Remove from the oven.
Place a large pan of salted boiling water on the heat and add the pasta. Cook for about 10 minutes until the pasta is al dente.
Drain the pasta and add to the vegetables. Add the prosciutto and the cheeses. Stir the whole lot together to amalgamate the vegetables with the pasta and cheese.
Return to the oven and bake for another 30 minutes until bubbling.
Serve with simple green salad.