I have to admit, as much as I love taking portraits, I also have a fascination for
snoot to just get light on the olives. The power setting on this light was very low, around 1/64 power, because I didn't want to add too much light to the scene, just enough to highlight the olives. The piece of black construction paper I was using on top of the glass was also used as a gobo to block that overhead light from lighting the rest of the glass.
Edit: (I also used a different martini glass for this shot)
This technique is really useful whenever you're lighting glass objects with or without liquids in them. You can read more about this technique called "bright field lighting" in the book Light, Science and Magic. This is not nearly as difficult as it may seem and you can have a lot of fun with it.
If anyone has any questions about this technique, just sound off in the comments!