Beginning note! I didn't make this technique up (thank you Internet!) but it's so simple and tasty that I thought I'd share :D
Put some water into your double boiler or saucepan and heat it until it simmers. The bowl you put on top needs a good seal with the pot, and don't cover it! Chocolate doesn't like moisture.
Now fill it with something delicious! I like chocolate mousse or berries, but would love to hear other tasty possibilities! These seem to last better if kept refrigerated until eaten ps! Enjoy :)