Preheat oven to 350ºF. Lightly grease a 13 x 9 baking pan. In a small bowl, whisk together grapefruit juice and cornstarch. In a large bowl, combine pineapple, grapefruit, granulated sugar, cinnamon, ginger and basil. Add grapefruit juice mixture; toss to mix. In a separate bowl, combine oats, light brown sugar and flour. Using a fork, cut in butter until mixture is crumbly. Add half of the pineapple mixture to the baking pan. Sprinkle with half of the oats mixture. Top with remaining pineapple mixture; sprinkle with remaining oat mixture. Bake 30 minutes. Remove from oven and sprinkle with nuts. Bake an additional 15-18 minutes or until mixture is bubbly and top is golden. Serve warm. If desired, top with vanilla ice cream and caramel sauce. Makes 12 servings. 2016 Ocean Spray® "Surprisingly Versatile" Grapefruit Recipe Contest First Place Winner, Naylet LaRochelle Per Serving: Calories 440 Total Fat 22g (34% DV) Sat Fat 11g (55% DV) Trans Fat 0g Sodium 0mg (0% DV) Carbohydrates 62g (21% DV) Dietary Fiber 4g (16% DV) Sugars 41g Protein 4g