Put the chocolate in a medium heatproof bowl. In a small saucepan, bring the cream to a boil. Pour the hot cream over the chocolate and whisk gently until the chocolate is completely melted and smooth. (If using a 70% bittersweet chocolate, the ganche might be a bit thick; add more cream, a tablespoon at a time, to thin it. You might also want to add a couple of teaspoons of sugar when you add the hot cream.
Make Ahead Tips
Ganache will keep for a week in the refrigerator, covered. Rewarm gently before using.
Photo: Scott Phillips