Use this hot fudge sauce to make our Banana Split Bombe.
In a medium saucepan over medium-high heat, combine the chocolate, butter, sugar, water, and salt. Stir continuously until melted and combined. Add the corn syrup, and bring the mixture to a boil.
Reduce heat, and simmer on low, stirring occasionally, until thickened, about 10 minutes. Remove from heat, and cool to room temperature.