This creamy asparagus soup is a comforting and nutritious dish perfect for springtime or any time you crave a fresh vegetable puree. Made with tender leeks, potatoes, fresh asparagus, and accented with fragrant basil and pine nuts, it offers a smooth, velvety texture enhanced by a dollop of creamy Greek yogurt. It’s easy to prepare on the stovetop and makes a delicious starter or light meal for four.