Spaghetti with cauliflower, kale and hazelnut "pesto"

Make the most of our lovely autumnal vegetables by chucking together this fabulous "pesto" and pasta.  I'm calling it "pesto" because it's a hand cut chunky sauce, not a finely blended herby sauce.  this means that you can really taste the chunks of roasted cauliflower and hazelnuts in their separate loveliness as well as the mixture.

Cauliflower
Olive oil
Garlic - quite a lot
cavolo nero
parmesan
hazelnuts
lemon zest
spaghetti (gluten free in our case - but could be standard, or some other long pasta)

1.  Break the cauliflower into smallish florets, and roast in olive oil for about 30 minutes.
2.  Meanwhile mix together finely sliced garlic, shredded cavolo nero, grated parmesan and roughly chopped hazelnuts with a good splosh of olive oil.
3.  Boil the water for the pasta.
4.  Sprinkle the cavo nero, hazelnut and parmesan mixture over the cauliflower and return to the oven to roast for a further 10 minutes.
5.  Cook the pasta, drain, reserve a ladleful of the cooking water.
6.  Mix the vegetable sauce with the pasta and the spoonful of water and toss.  Grate over a little lemon zest and a good grind of black pepper.
7. Serve, scoff, be amazed at how well it all goes together.