Creamy Asparagus Soup

Ingredients:
1 pound fresh asparagus
3/4 cup chopped onion
1/2 cup vegetable broth
1 tablespoon butter
2 tablespoons all-purpose flour
1 teaspoon salt
1 pinch ground black pepper
1 1/4 cups vegetable broth
1 cup soy milk
1/2 cup yogurt
1 teaspoon lemon juice

Directions:
Place asparagus and onion in a saucepan with 1/2 cup vegetable broth. Bring the broth to a boil, reduce heat and simmer until the vegetables are tender. Set a few asparagus spears aside for garnish. Place remaining vegetable mixture in an electric blender and purée until smooth. In the same pan that was used to simmer the asparagus, melt butter. Sprinkle flour, salt, and pepper into the butter, stirring continuously for approximately two minutes. Remove before the flour browns. Stir in remaining 1 1/4 cups vegetable broth and increase the heat. Continue stirring until the mixture comes to a boil. Stir the vegetable purée and milk into the saucepan. Whisk yogurt into the mixture, followed by lemon juice. Stir until heated through. Ladle into bowls and garnish with asparagus stalks.