Add chicken stock and bring to a gentle simmer. Cook, stirring occasionally, until pumpkin is completely cooked through and soft.
Using a stick blender, blend the soup thoroughly, until velvety smooth. Add nutmeg and season to taste with salt and pepper. Stir to combine and cover with lid. Set aside.
In a medium frying pan on medium heat, add oil and sliced cauliflower. Cook until cauliflower is golden brown and tender. Remove from pan and add pine nuts. Cook for 1-2 mins or until golden. Remove and set aside.
To serve, ladle soup into serving bowls and top with cauliflower slices, pine nuts, cream and green onions. Serve immediately.