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Preheat the oven to 400°.
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Line baking sheet with foil.
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Toss grapes with the vinegar, rosemary sprigs and 2 tablespoons olive oil.
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Sprinkle with sea salt and pepper.
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Roast grapes for 15 minutes or until the grapes are softened and the skins start to pop.
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Slice baguette into ½ inch slices.
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Brush slices, on both sides with olive oil.
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Arrange on a baking sheet and toast for about 5 minutes.
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Top with brie slices and roast for another 3 minutes, or until cheese has started to melt.
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Once cheese has begun to melt, remove from oven.
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Top easy crostini with a few roasted grapes and sprinkle with chopped rosemary.
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Serve immediately.