Sautee the onion, squash, carrots, apple, ginger, and spices with the oil in a large soup pot. Once things start to caramelize a bit add the broth and lemon juice. Bring to a low boil. Continue to cook until the butternut softens enough to puree, about 30 minutes.
1 teaspoon olive oil, 1 onion chopped, 1 butternut squash cubed, 2 carrots chopped, 1 apple chopped, 1 chunk fresh ginger chopped, ½ teaspoon curry powder, ¼ teaspoon cinnamon, ¼ teaspoon rosemary, ¼ teaspoon white pepper, ⅛ teaspoon Cardamon, 4 cup broth, 1 tablespoon lemon juice