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Remove Mini Fillo Shells from the freezer and allow to thaw.
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Arrange grapes in a single layer on a parchment-lined baking sheet
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Drizzle olive oil over grapes
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Roast grapes at 400 F for 15 minutes or until the grapes begin to burst. Do not over-roast as the grapes will begin to char
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While grapes are roasting, combine mascarpone cheese, honey, and vanilla bean seeds (do not add the pod)
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Place a thin layer of chopped walnuts on the bottom of each mini fillo shell
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Fill each tart with the mascarpone-honey mixture using a pastry bag (you can also place in a Ziploc bag and cut off a small portion of the tip)
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Allow grapes to cool before placing on top of each tart
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Garnish with rosemary
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Serve immediately