Preheat the oven to 200°C/400°F/gas mark 6.
Arrange the pears, carrots and new potatoes in a roasting tin, then scatter with the dried sage. Drizzle with the sunflower oil and roast in the oven for 30 minutes.
Carefully remove the tin from the oven and add the butter beans evenly across the tin. Reduce the oven temperature to 180°C/350°F/gas mark 4 and bake for a further 10 minutes.
Season generously with sea salt and black pepper just before serving.
If you can't get hold of baby carrots, use two ordinary carrots, peeled and roughly chopped.
This recipe is delicious served with mushroom gravy, which brings the sweet and earthy flavors together.