INGREDIENTS
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6 apples, such as Granny Smith, peeled, halved, cored, and roughly chopped
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4 tbsp/55 g unsalted butter
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1 cup/200 g granulated sugar
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1/4 tsp kosher salt
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1/2 vanilla bean
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1 batch Puff Pastry dough
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1 cup/240 ml Frangipane
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1 large egg
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Special equipment: rimmed baking sheet, parchment paper, rolling pin, bench scraper (optional), offset spatula (optional), pastry brush