Break 8 oz. of semi-sweet chocolate into squares or chop into small pieces.
In a small saucepan, heat 1 cup of heavy whipping cream over medium heat until it comes to a simmer (small bubbles will appear at the edges).
Remove cream from the heat and add the chocolate pieces, stirring until the chocolate melts and the mixutre is smooth. If the mixture cools before the chocolate melts entirely, stir constantly over low heat, just until chocolate is melted.
Let the chocolate ganache mixture cool for 10 minutes before moving on to the next step.