Unwrap chocolate bar and cut into several pieces.
Combine a few pieces of the chocolate with whipping cream in a metal bowl and place on top of a saucepan half-filled with simmering water. Stir frequently on low heat, making sure the mixture doesn’t come to a boil.
Continue adding more chocolate, a few pieces at a time, until all the chocolate is melted. Transfer the mixture to the fondue pot and set on the burner. Keep the fondue warm on low heat.
Refrigerate sliced fruit until the fondue is ready to serve. The chocolate cools down when it meets the chilled fruit, making it harden slightly.