I absolutely adore making these cute little chocolate bowls. They are so easy and fun and they never cease to amaze. Because I always make and consume them within the same day, I don't worry about tempering the chocolate. I just try to be sure that I do not let my chocolate get too hot in my double boiler. The risk there is that too high a temperature can cause the chocolate to end up not hardening at all. Not a good thing, obviously.
Melt enough semi-sweet chocolate in a bowl over some lightly simmering water. Prepare a sheet pan with some parchment, wax paper, or a Silpat. The first step is to make a small puddle of chocolate that will become the base of your bowl. Keep the puddle somewhat small, you don't want it oozing all over the place!
When making bowls, always do a few extra because it is not unheard of for one or two to break one while removing the balloon. Place the tray in the refrigerator to harden for 30-60 minutes. To remove the balloon, be ready to work quickly! If the chocolate softens just a little too much, I find it makes removing the balloon more challenging. Take a straight pin and - pinching the top of the balloon - carefully poke a hole in it. Slowly let the air out. As the balloon deflates, you can start to peel it away from the bowl. Deflating the balloon too rapidly will usually result in a broken bowl, so go easy! Once the balloons are removed, chances are you'll want to keep them in the refrigerator. If you'd rather have bowls that are more shelf stable and can be made ahead of time, you can do that, you'll just have to be sure to temper the chocolate then. Serve with ice cream or mouse... or anything that goes well with chocolate and is served in a bowl!