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I’ve personally never done a cook, freeze, reheat but Guga from Sous Vide Everything did the same experiment:
The only difference between his and your approach is that he used the sous vide again to reheat the steaks for 30 mins at the same cook temp. I would try to go that route but if not possible, try to heat the water using a pot, flame, and thermometer to thaw at the cooking temp.
A percise water temp to thaw may be unnecessary since the meat should already be fully cooked. Let us know how it turns out. I’m curious.
I highly recommend seasoning your steaks with this stuff (check your local Costco):
Just add pepper. The butter and garlic flavor really come through.