I simply couldn't get my head around why one would sous vide a steak. I like my steak blue and the KK cooks it perfectly well, at high heat, in 3 minutes max. Why mess around with vacuum packing and sitting around in a water bath?
Well, I was intrigued by @tony b's suggestion that I try to "confit" a dairy cow steak in its own fat. So I tried it. Marinaded the meat for a few hours in oil, salt and tarragon. Put some cold cow fat into each vacuum bag.
Now, how to avoid over cooking the steaks? I went for 45C for 1.25 hrs. Then I chilled them back down in the fridge before introducing them to the KK for just under 2 minutes. The result was messy but sublime.