Combine first 5 ingredients in a large bowl; set aside.
Combine sugar and cornstarch in a small saucepan; gradually whisk in 1/2 cup water, orange juice, and lemon juice until blended.
Bring sugar mixture to a boil, whisking constantly, over medium heat. Boil, whisking constantly, 1 minute.
Pour mixture over fruit, tossing gently to coat. Cover and chill 4 hours.