This recipe for Zucchini and Leek Soup from Gwyneth Paltrow's latest cookbook, It's All Easy, is the perfect September soup. September's a weird month in Chicago. It's gotten up to almost 95 degrees this week (!), but next week will be down to the mid-60s. While it's not quite soup season yet, this vegan Zucchini and Leek Soup from It's All Easy (published by goop press) is super light and creamy and can be served either hot or cold — perfect for summer and fall months. It's vegan, …