Sweet Potato and Star Anise Soup

Ingredients :

Unsalted butter	2 tablespoons
Yellow onion	3/4 cup
Fresh ginger	2 1/4 teaspoons
Anise pods	4
Sweet potatoes	2 1/2 pounds
Vegetable broth	4 cups
Water	1 cup
Half-and-half	1/2 cup
Sour cream	6 tablespoon

Directions :

• Melt the butter in a large pot over medium heat. When it foams, add the onion, season with salt and freshly ground black pepper, and cook, stirring occasionally, until the onion is softened and translucent, about 5 minutes.
• Stir in 2 teaspoons of the ginger and the star anise. Add the sweet potatoes and stir to combine.
• Add the broth and water and stir well, scraping up any browned bits from the bottom of the pot. Increase the heat to high and bring the mixture to a boil. Reduce the heat to low and simmer, uncovered, until the sweet potatoes are completely tender, about 12 minutes. Remove from heat.

• Allow the soup to cool slightly. Remove the star anise pods and discard. Process the soup in batches in a blender or food processor until very smooth. Return the soup to the pot and reheat over medium-low heat. Season with additional salt and pepper as necessary. Stir in the heavy cream, if using.
• Combine the sour cream and remaining 1/4 teaspoon ginger in a small bowl, stirring until well mixed.
• Serve the soup in warmed bowls, topped with a dollop of ginger cream.