After you’ve prepped the cake pan and fired up the double boiler, turn your attention to your chocolate and stick of butter. Chop the 4 ounces of chocolate with a sharp chef’s knife on a sturdy cutting board. Chopping chocolate is oddly satisfying, especially when you know you’re about to melt it with butter, so enjoy your moment of zen here.
Once you’ve taken a break while chopping your chocolate, you’ll then put the chocolate bits and the butter in the top of the double boiler. Stir until the chocolate and butter mixture is smooth, then immediately remove the mixture from the heat.
Again, if you are using a bowl over a saucepan of water in place of a double boiler, be extra careful to not burn the butter and chocolate concoction. Never let the bowl touch the water during this step, as burnt chocolate is a truly nasty flavor. But, never fear, as taking a few minutes to be mindful of the process is all you really need to safely make the mixture.