Place the chocolate in a large microwave-safe bowl and melt it. Or place the bowl over a pan with simmering water. Make sure the water does not touch the bowl.
Bring the cream to a simmer, and pour it over the melted chocolate.
Gently stir using a rubber spatula or a wooden spoon until smooth.
Let sit at room temperature until cooled and set.
Notes
Apply the drip over the cake before it is completely set.
To warm, place it over a double boiler, or heat a small amount in the microwave and mix it with the rest.
Store at room temperature for up to 48 hours or in the refrigerator for up to ten days.
To color, add the food coloring to the heavy cream or the ganache while it is warm.
Add flavor extract to the heavy cream.
Use a rubber spatula or a wooden spoon to mix; a whisk might incorporate too much air.
Gently tap the bowl before setting the time to release any trapped air.