This is a great sauce that can be used over ice cream, puddings, fruit whatever you can think of. It thickens up when it is cold to the point it makes a soft spoonful. The warmer it is the runnier it will get.
It is important not to stir it while it is boiling down. Stirring risks burning it in the trail of the spoon. Just keep moving the pan to keep the mixture swirling. It is also important to keep cleaning the ring of sugar that will start to crystallize on the inside of the pan. Use a spatula or a wet silicone brush to stir in any crystals.
Do not leave this pan unattended…sugar can burn really quickly and it would be such a shame to ruin this addictive sauce!