Fill SmartHub with water and set temperature to 185°F.
Split the vanilla beans lengthwise and add half & half, sugar, salt, nutmeg, grapefruit zest, cinnamon sticks, and egg yolks to a vac-snap bag—seal and shake to combine, then add to the preheated SmartHub for 1 hour.
Remove bag and refrigerator overnight, or until cool to the touch.
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