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1. Preheat oven to 400 degrees F. In a 15x10x1-inch baking pan combine portobello and shiitake mushrooms. Drizzle with oil and sprinkle with salt and pepper; toss to coat. Spread mushrooms in a single layer. Roast, covered, for 30 minutes. Roast, uncovered, for 15 to 18 minutes more or until mushrooms are tender, but still moist. Cool slightly.
2. In a food processor or blender combine half of the mushrooms and 3/4 cup of the broth. Cover and process or blend until smooth.
3. In a medium saucepan heat butter over medium heat until melted. Add onion and garlic; cook about 5 minutes or until onion is tender, stirring occasionally. Carefully add sherry. Simmer, uncovered, about 1 minute or until most of the liquid is evaporated. Stir in flour; cook and stir for 1 minute. Stir in the remaining mushroom halves, the pureed mushrooms, the remaining 3/4 cup broth, and evaporated milk. Bring to boiling; reduce heat. Simmer, uncovered, about 10 minutes or until mixture is slightly thickened.
4. Meanwhile, for gremolata, in a small bowl combine dill and lemon peel. Ladle soup into small serving bowls. Sprinkle with gremolata.