Preheat your oven to 400°F (200°C).
Rinse the grapes thoroughly under cold water and pat them dry with a paper towel.
In a small bowl, whisk together the balsamic vinegar, olive oil, and honey until well combined.
Place the grapes on a baking sheet lined with parchment paper.
Drizzle the balsamic mixture over the grapes, ensuring they are evenly coated.
Season the grapes with a pinch of salt and freshly ground black pepper.
Scatter rosemary sprigs on top for added flavor, if desired.
Roast the grapes in the preheated oven for 20-25 minutes, or until they are soft and slightly caramelized.
Remove from the oven and let them cool slightly before serving.
