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1
Heat the broiler. Line a baking sheet with parchment and generously butter the parchment. Spoon the Fluff onto the parchment. Wet your hands and pat out the Fluff into a thin layer (see photos below) that nearly covers the baking sheet.
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2
Place the Fluff under the broiler (about 6 inches from the flame) and toast all over. Remove the baking sheet from the oven. Using a spatula, turn in the sides of the Fluff, folding it like a letter, to expose the un-toasted portions. Place under the broiler and toast all over, again. Remove from the oven and let cool completely.
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3
Put the graham crackers in a sturdy plastic bag, and using either a rolling pin or the base of a small saucepan, pound the crackers into coarse crumbs. Spread half of them in the base of an 8-inch baking dish.
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4
Set out the ice cream for 10 minutes. Place it in the bowl of a mixer fitted with a paddle attachment (if you don't have a mixer, you can mix it by hand and skip the gym this week). With the mixer on low, mash the ice cream to loosen it a bit. Add the toasted Fluff and mix until just blended but not broken down -- you want there to be chewy bits. Scrape into the baking dish and freeze.
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5
Meanwhile, melt the chocolate and oil in a double boiler, whisking until they're smooth.
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6
To serve, spread the remaining graham cracker crumbs on top of the semifreddo. Drizzle the top with as much chocolate as you like! (You may also pass a pitcher of chocolate at the table, which your guests will appreciate.)
