Preheat oven to 425 F and line baking sheet with large piece of foil; fold in sides slightly to form rim.
Place grapes on foil and top with vinegar, olive oil and sea salt. Stir lightly to coat grapes. Roast 30 minutes, stirring every 10 minutes. Let cool slightly.
Place cheese in decorative shallow bowl and top with grapes. Sprinkle with pistachios and basil. Serve with baguette slices.
Notes
Nutritional information per serving: 290 calories; 11 g protein; 35 g carbohydrates; 12 g fat (37% calories from fat); 5 g saturated fat (16% calories from saturated fat); 20 mg cholesterol; 390 mg sodium; 1 g fiber.