Leek, Asparagus & Herb Soup is a gluten free and vegetarian soup. One serving contains 153 calories, 7g of protein, and 5g of fat. This recipe serves 6. A mixture of flat-leaf parsley, salt, yogurt, and a handful of other ingredients are all it takes to make this recipe so scrumptious. It is perfect for Autumn. From preparation to the plate, this recipe takes roughly 8 hours and 49 minutes.