Grapes do double duty in this innovative salad. They're pureed for fruity, tart, smooth dressing, which is used to top more grapes, shrimp, arugula, basil, and cheese.
To prepare dressing, combine first 7 ingredients in a blender; process until smooth.
To prepare salad, bring 4 cups water to a boil in a large saucepan. Add shrimp; cook 1 minute. Add celery; cook 1 minute. Drain and rinse with cold water; pat dry.
Place shrimp mixture, arugula, grapes, and basil in a large bowl. Drizzle with dressing; toss gently to coat. Top with cheese and walnuts.
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