Add the brown sugar, butter and fresh cream together in a heavy-bottomed pan.
Stir all till combined, and cook on a medium-low flame. Allow it to come to a boil while stirring continuously.
After cooking for 5-6 minutes in total, and once it comes to a boil, switch off the flame.
Transfer the sauce to a clean, sterilized glass jar. Let it cool completely, then cover and refrigerate.