Halve, peel and de-seed the pumpkin. Chop one half of the pumpkin into small cubes. Use a box grater to grate the other half. Set aside
Place a large saucepan over medium/low heat and add the onion. Fry for a minute then add the garlic. Fry until the onion is softened but do not let the garlic brown.
Add the orzo, vegetable stock, dry white wine and both the cubed and grated pumpkin. Stir to combine and bring to a gentle simmer.
Remove from the heat, cover with a tight-fitting lid and place in the preheated oven. Bake for 35-40 minutes.
Remove from the oven and season with salt and pepper to taste. Add the vegan butter and stir to combine. Serve with more black pepper and your favourite vegan parmesan.