Trim tough/bottom parts of asparagus off and cut the rest of the spears into 1-inch pieces.
Melt butter in a large saucepan over medium-low heat. add the leeks and cook, stirring occasionally, until the leeks are soft and starting to brown a bit (5-10 minutes).
Add the cream, 2 cups of water, 2 teaspoons of salt, and 1/2 teaspoon pepper.
Increase heat and bring liquid to boil. add asparagus, lower to a simmer, and cook until the asparagus is tender but still quite green.
Add the lemon juice puree the soup in a blender or food processer
Season to taste - top with the croutons & chives for garnishing