Soups like this make me look forward to the cooler weather of fall and winter. This curried butternut squash soup is smooth, creamy, warming and comforting. Butternut squash soup is one of my favorites, and I've tried many, but I love this recipe for its complex flavors. You can add more curry paste if you prefer it spicy. If you can find lime leaves, they add even more flavor while simmering (pull them out before serving).