8 basil leaves
4 courgettes, sliced into 1cm/陆in circles
2 white onions, thinly sliced
300驳/10陆辞锄 spaghetti
salt and freshly ground black pepper
4 tbsp olive oil
2 free-range egg yolks
100驳/3陆辞锄 Parmesan (or vegetarian alternative), grated