Simple Butternut Squash Soup

2 tablespoons olive oil
1 onion, chopped
1 stalk celery, chopped
1 medium carrot, chopped
2 medium potatoes, cubed
1 medium butternut squash - peeled, seeded, and cubed
32 oz. vegetable stock
Celtic sea salt and freshly ground black pepper to taste

Heat the oil in a large pot, and cook the onion, celery, carrot, potatoes, and squash 5 minutes, or until lightly browned. Pour in enough of the stock to cover vegetables. Bring to a boil. Reduce heat to low, cover pot, and simmer 40 minutes, or until all vegetables are tender.

Transfer the soup to a blender, and blend until smooth. Return to pot, and mix in any remaining stock to attain desired consistency. Season with salt and pepper.