I prepare all tender cuts of ibérico at 55ºC, time as needed for heat to reach core according to tables/apps (or longer for pasteurization), then quick sear. Works well with loin, tenderloin, and presa (pictures on dinner thread). Ibérico cheeks have become my all-time best meat for sous-vide, 36 hours at 65ºC, pictured on the dinner thread. What about collar? We used to do a foie gras burger with it but I don't have a mincer at home (or trade prices foie!)