Carot Coconut Soup

1/4 cup (1/2 stick) unsalted butter
1 pound carrots, peeled, chopped
1 medium onion, chopped
Kosher salt and freshly ground black pepper
2 cups low-sodium chicken broth
13.5-oz. can unsweetened coconut milk
2 tablespoons Thai-style chili sauce plus more for serving
Fresh cilantro leaves (for serving)

Melt butter in a large saucepan over medium-high heat. Add carrots and onion, season with salt and pepper, and cook, stirring often, until carrots are softened, 15–20 minutes. Stir in broth, coconut milk, and 2 Tbsp. chili sauce. Bring to a boil, reduce heat, and simmer, stirring occasionally, until vegetables are very soft and liquid is slightly reduced, 40–45 minutes.

Let soup cool slightly, then purée in a blender until smooth. Reheat in a clean saucepan, thinning with water to desired consistency; season with salt and pepper.

Divide soup among bowls, drizzle with chili sauce, and top with cilantro.