In a 3 qt saucepan over medium heat, melt butter.
Add onions and saute for 5 minutes, or until onions have turned translucent.
Add butternut squash and vegetable stock. Mix. Bring to a boil.
Reduce heat to low. Cover and cook for 20 minutes.
Sprinkle star anise and mix. Remove from heat.
Careful spoon into a blender and blend on low speed.
Pour the mixture back into the soup pot, and re-heat. Cook for 2-3 minutes on low heat.
Pour into soup cups, garnish with sunflower seeds, some crushed black pepper, and a drizzle of cream.
Serve with toasted sourdough slices.