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Preheat oven to 350
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Stir together mascarpone, vanilla bean paste and cinnamon and refrigerate at least 30 minutes
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Brush a baking dish with 1 tablespoon of the butter and arrange peaches in the baking dish cut side up - you can slice of a small piece of the back for them to sit flat in the dish
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Whisk together honey and butter and pour over the peaches, use a pastry brush to make sure they are covered all over
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Roast until softened and somewhat browned, 25 - 30 minutes
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Fill each of the peach halves with the mascarpone mixture
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Garnish with chopped tarragon leaves and pistachios, if using
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Serve immediately