Add the sugar in a pan, and heat it on a medium-low flame. Use a wooden spoon to stir lightly, but not very frequently. Sugar will begin to melt and will first make
clumps before it melts entirely into a golden colored liquid.
Once the sugar has fully melted and is lump-free, add the butter and stir till butter is well incorporated with the melted sugar - 1 minute.
Slowly add the cream (the caramel will bubble vigorously at this point) and stir well. Let the caramel reach boiling point, then switch off the flame and add the salt. Mix well, then cool and use.