Special equipment: a candy thermometer, 2-inch flower-shaped cookie cutter and flexible 12-cup mini cupcake pan
Combine the gelatin with 1/3 cup water in a small bowl. Combine the confectioners' sugar and cornstarch in a separate bowl. Sprinkle 2 tablespoons of the cornstarch mixture in a 9" x 13" quarter sheet tray.
Cook the granulated sugar, corn syrup, salt and 1/4 cup water in a small saucepan over medium-high heat until the sugar reaches 235 degrees F on a candy thermometer, 3 to 5 minutes. Transfer to a large bowl and combine with the bloomed gelatin and vanilla bean seeds. Beat with a hand mixer on medium high until thick and fluffy, about 6 minutes. Spray a rubber spatula with cooking spray and use it to scrape the marshmallow mixture into the prepared pan. Spread evenly and dust with the remaining cornstarch mixture. Let set overnight at room temperature.
Spray a 2-inch flower-shaped cookie cutter with cooking spray and cut out 12 flower marshmallows. Save the marshmallow scraps to cut into small cube-shaped marshmallows, if desired.
Melt the white chocolate in a heatproof bowl set over a pot of simmering water (the bottom of the bowl shouldn't touch the water), stirring occasionally. Place three candy pearls in the center a flower. Gather the petals at the top to close the flower and dip the bottom in the melted chocolate to hold it together. Place in a flexible 12-cup mini cupcake pan to set. Repeat with the remaining flowers.
To serve, pop the flowers out of the muffin cups and place them in hot chocolate to watch them bloom.
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