Use this meditation from my friend, Stewart Blackburn, the Shaman of Pleasure:
Take a small piece of the chocolate, hold it in your hands and give thanks for it. Feel its shape and texture. Then smell it. Take your time and get as much sensory information from it as you can without putting it into your mouth. Note how you feel in anticipation of eating this chocolate.
Let each breath help you to relax into this experience. This is about being as thoroughly in your body as you can, present to all you perceive.
With great consciousness and flair put the chocolate into your mouth and focus your full attention on the sensations you experience in your mouth. Feel it melt and move around in your mouth. Be aware of the sweetness on your tongue, the creaminess in your mouth, and all of the delicious flavors present. Prolong the experience as much as you can while being aware of how it makes you feel emotionally. See how deeply you can enjoy this chocolate.
Now turn your attention to an awareness of the pleasure you are experiencing. Let the chocolate help you hold your attention on the source of the pleasure, but now your focus is on the pleasure itself. Let your experience of pleasure fill your whole body. With each breath let it expand beyond the limits of your body. Slowly, breath by breath, let your pleasure fill the whole room. Let your pleasure keep on expanding and expanding, all the way out into the universe. Allow yourself to totally enjoy the magnificence of your new expanded pleasure. Give yourself permission to hold this for as long as you want. And when you are ready for this to end, give thanks and reset yourself for new delights.