Fry the sage leaves in a little olive oil. They really only take 3 seconds or so - then remove from the pan with a slotted spoon and sprinkle with salt.
Then fry the onion and garlic in the oil for 5 minutes or so until lovely and soft. Remove these and set aside.
Use the same pan to fry the butternut squash. It will take 15-20 minutes. Ideally you want it lovely and golden on the outside but soft to the touch when you poke it with a knife. Keep an eye on it and give it a shake every couple of minutes.
Once the squash is cooked - bung it in a food processor with the onions and garlic and blitz it up! add 1 cup of boiling water - with the 1/4 veg stock cube and whizz it all together again. It will take a good few minutes but it will go lovely and creamy.
Keep tasting to test the seasoning.
Cook the pasta in boiling salty water. Save 1 mug of the cooking water so you can loosen the sauce.
Add 1/2 the sauce, loosen a little with the water and add more sauce if you want it. You dont want it drowning in it - but it’s up to you what you like. I dont want to boss you around.
Pile onto plates, top with the crispy sage leaves, toasted pine nuts and grated parmesan and lots of black pepper.