Sauce au Chocolat

In a small saucepan, melt chocolate with 1/2 cup water over medium heat, about 2 minutes. When mixture comes to a boil, whisk gently until smooth. Continue whisking while sauce gently boils for 1 minute. (If sauce is too thin, cook it longer. If it is too thick, add more liquid, and return to a boil.) Remove from heat, and allow to cool to room temperature.