Roasted Asparagus Soup with Spring Herb Gremolata

Preparation Preheat oven to 425°F. Combine asparagus, leeks, and oil in very large bowl; toss to blend. Divide between 2 large rimmed baking sheets. Sprinkle with salt and pepper. Roast vegetables until asparagus pieces are soft and leeks are golden, stirring occasionally, about 45 minutes; cool on sheets. Spoon 1/3 of vegetables into blender; add 2 cups broth. Blend until smooth. Transfer to large pot. Repeat 2 more times, using half of remaining vegetables and 2 cups broth for each batch. Warm soup over medium heat, thinning with more broth by 1/2 cupfuls, if desired. Season with salt and pepper. DO AHEAD: Can be made 1 day ahead. Cool slightly. Cover; chill. Rewarm before continuing. Mix parsley, lemon peel, tarragon, and garlic in small bowl for gremolata. Ladle soup into bowls. Sprinkle with gremolata and serve.

Preparation Preheat oven to 425°F. Combine asparagus, leeks, and oil in very large bowl; toss to blend. Divide between 2 large rimmed baking sheets. Sprinkle with salt and pepper. Roast vegetables until asparagus pieces are soft and leeks are golden, stirring occasionally, about 45 minutes; cool on sheets. Spoon 1/3 of vegetables into blender; add 2 cups broth. Blend until smooth. Transfer to large pot. Repeat 2 more times, using half of remaining vegetables and 2 cups broth for each batch. Warm soup over medium heat, thinning with more broth by 1/2 cupfuls, if desired. Season with salt and pepper. DO AHEAD: Can be made 1 day ahead. Cool slightly. Cover; chill. Rewarm before continuing. Mix parsley, lemon peel, tarragon, and garlic in small bowl for gremolata. Ladle soup into bowls. Sprinkle with gremolata and serve.