I keep mine in the freezer than take one out 1.5-2 hours before you want it and give the pack a 'squish' ever half hour to make it go softer evenly .. or earlier and keep in fridge .. although not 'recommended ' by cambridge it keeps me on track
this thread inspired me to try one tonight for tea. it was amazing. I'm just really sad now because it was my last one until my WI on thursday! the normal shakes will never live up to that little chunk of heaven I just ate!