Creamy Grape Salad with Pecans

Bahan-bahan (8 porsi)

• 1 pound green grapes (sliced in half lengthwise, about 2 cups)
• 1 pound red grapes (sliced in half lengthwise, about 2 cups)
• 1 cup sour cream
• 3 tablespoons sugar
• 1 vanilla bean (scraped or 1 teaspoon vanilla extract)
• 1 cup chopped pecans