Add the leeks, parsnip, celeriac, sage, fennel seeds and oil to an oven proof roasting dish. Season and mix well.
Roast in the oven for 20 mins, mixing half way through at 220 degrees c.
Meanwhile mix the stock cube, miso and butter with 5dl/ 500 ml of just boiled water. Keep mixing until the butter has melted. Stir in the cream and nutritional yeast and season.
Once the veg are roasted, add the cream mix and pasta. Mix and cover tightly with foil before baking in the oven for 40 mins.
Remove from the oven and allow to sit for 5 mins.
Squeeze over the lemon and stir in the juice. Serve topped with toasted nuts, a sprinkling of sage and a good grating of Parmesan
