Dry brine prime rib the day before.
Set oven to lowest temperature. (170ºF on Wolf or 135ºF Sous Vide Mode 100% humidity on Anova Precision Oven)
Roast prime rib on rack until internal temperature hits 130ºF (medium rare) and remove from oven. (5 hours for 3 pound prime rib in my oven which hovered around 160ºF on "roast" setting.)
Tent with foil and rest for 30 min - 1 ½ hours.
If it finishes more than 1 ½ hours before serving, remove from oven and put back into oven for 45 min at 200ºF before searing to reheat.
Sear at max temperature in oven (550ºF on Wolf) for 6 - 10 min.
Slice and serve.
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