1. To prepare walnuts: Line a small baking pan with parchment paper or foil; coat with cooking spray. Preheat oven to 400 degrees.
2. Toss walnuts in a bowl with water. Sprinkle with brown sugar and salt; toss to coat well. Transfer to the prepared pan. Bake until the sugar is melted and the nuts are barely starting to brown, about 6 to 8 minutes. Cool in the pan until the sugar hardens, about 6 minutes.
3. To prepare the salad: Meanwhile, combine sour cream, cream cheese, honey and vanilla in a food processor and puree until smooth and creamy. Transfer to a large bowl. Add grapes and gently stir to combine. Transfer to a serving dish. Crumble the candied walnuts on top just before serving.
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