Unleash Your Culinary Skills with Creamy Asparagus Delight

Combine asparagus, 1/2 cup chicken broth, and onion in a large saucepan; cover and bring to a boil over high heat. Reduce heat to medium-low and simmer, uncovered, until asparagus is tender, about 12 minutes. Transfer the mixture to a blender; puree until smooth and set aside.

In the same saucepan, melt butter over medium-low heat. Stir in flour, salt, and pepper; cook, stirring constantly, for 2 minutes.

Increase heat to medium; add remaining chicken broth, stirring constantly, until the mixture boils. Stir in pureed asparagus and milk.

Place sour cream in a small bowl and stir in a ladleful of hot soup until blended; pour into the soup and stir in lemon juice. Warm soup through to serving temperature, without boiling. Serve immediately.