Layer # 3
Break up the chocolate in a saucepan or double boiler.
Add butter & stir constantly. Do not let it cook, you just want it to melt & combine.
Moving quickly, spread the melted chocolate on top of chilled Layer # 1 & 2. Be careful not to stir up the cream level but if it shows through in a place or two it is no biggie. As you can see, mine is not very smooth but you do what you can.
I find it best to let it cool a bit (10 minutes) & score the chocolate with a sharp knife. This makes it easier to cut into ~ 1" cubes.
You are now done. Take a break & cut them after they have chilled.
Ian