Basically it turned in to toffee, which ended up being far top hard to eat to be remotely enjoyable, so I turned it in to delicious toffee sauce. I used to (about 20 years ago be quite successful at making proper crumbly fudge, but this time was cautious about under cooking it so overcooked it. When's it ready? I have a thermometer and know it should be 240 degrees, but in practice, I buggered it up. Help.