4 oz unsalted butter
4 oz light brown sugar
1/2 cup heavy cream
1/4 cup Kahlua
 
Melt butter in saucepan. Stir in light brown sugar. Continually stir until mixture starts to bubble and act like taffy. Be very careful, it is very hot. Once the sugar and butter have reached taffy stage remove from heat; then slowly add the the heavy cream. Next add the Kahlua, stir well.