Autumn Carrot and Sweet Potato Soup

Bahan-bahan (8 porsi)

• 4 tablespoons unsalted butter
• 2 medium yellow onions, (chopped)
• 1 tablespoon curry powder, (plus a bit more for serving)
• 1 pound carrots, (peeled and chopped into 1-inch (2.5-cm) pieces)
• 1½ pounds sweet potatoes ((about 2 small), peeled and chopped into 1-inch (2.5-cm) pieces)
• 8 cups chicken broth, (best quality such as Swanson)
• 1¾ teaspoons salt
• 1 tart yet sweet apple, (such as Honeycrisp or Fuji, peeled and chopped)
• 2 tablespoons honey
• Freshly ground black pepper