Medium peaks are when we beat whipping cream to stiff peaks, where the cream will hold its shape and not move. Medium peaks occur before stiff peaks, where the cream still has some movement and flow. It isn’t slightly runny like soft peaks, but it won’t stay totally stiff either. You will likely need to beat your heavy cream for about two minutes to get these peaks. However if you end up whipping up the cream too much, to the “stiff peaks” point, your ice cream will still work. It is better to beat it too much than to beat it too little with this ice cream, otherwise, it might not set very well.