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1
Using a small, sharp knife split the vanilla beans lengthwise and scrape the seeds into a small bowl. Reserve the vanilla bean pods. Transfer about one-third of the seeds to a second small bowl and add 1 tablespoon confectioners' sugar. Using a mortar or the back of a spoon, pound and mix together. Add the remaining confectioners' sugar and stir to combine. Cover and let stand at least 1 hour. DO AHEAD:
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2
Add the bourbon to the remaining vanilla seeds and whisk to disperse the seeds. Set aside.
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3
Brush the bottom and sides of a 9-inch square baking pan with vegetable oil. Using a small, fine-mesh sieve, dust the pan generously with the vanilla sugar, knocking out any excess.
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4
Put 1/2 cup water in the bowl of a stand mixer fitted with the whisk attachment. Sprinkle the gelatin into the bowl and stir briefly to make sure all the gelatin is in contact with water. Let soften while you make the sugar syrup.
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5
In a heavy 3- to 4-quart saucepan, combine the granulated sugar, corn syrup, salt, and 1/2 cup water. Place over moderate heat and bring to a boil, stirring until the sugar is dissolved. Add the scraped vanilla bean pods to the pot then put a candy thermometer into the boiling sugar syrup and continue boiling (the mixture may foam up, so turn the heat down slightly if necessary), without stirring, until the thermometer registers 240u00b0F (soft-ball stage). Remove the saucepan from the heat and let stand briefly until the bubbles dissipate slightly. Using tongs, carefully remove the vanilla bean pods and discard.
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6
With the mixer on low speed, pour the hot sugar syrup into the softened gelatin in a thin stream down the side of the bowl. Gradually increase the mixer speed to high and beat until the marshmallow is very thick and forms a thick ribbon when the whisk is lifted, about 5 minutes. Whisk the bourbon-vanilla seed mixture to disperse the seeds, then add to the marshmallow and beat until incorporated.
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7
Scrape the marshmallow into the prepared pan (it will be very sticky) and use wet fingertips to spread it evenly and smooth the top. Let stand, uncovered at room temperature, until the surface is no longer sticky and you can gently pull the marshmallow away from the sides of the pan with your fingertips, at least 4 hours or overnight.
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8
Dust a cutting board with vanilla sugar. Use a rubber spatula to pull the sides of the marshmallow from the edge of the pan (use the spatula to loosen the marshmallow from the bottom of the pan if necessary) and invert onto the cutting board. Dust the top with vanilla sugar. Brush a long thin knife or a chef's knife with vegetable oil and dust with vanilla sugar to prevent sticking; continue dusting the knife as necessary. Cut lengthwise into 8 strips, then crosswise into eighths, to form a total of 64 squares. (For larger marshmallows, cut lengthwise into 6 strips, then crosswise into sixths, to form a total of 36 squares.) Coat marshmallows, one at a time, in confectioners' sugar, using a pastry brush to brush off any excess. DO AHEAD:
