Strobist info: Two speedlights, one against the background with a colored gel, one on the left side of the glass. With the second one I tried two alternatives: (1) a self-made snoot (rolled black cardboard), (1) an indirect light by flashing against a piece of white paper. The second one yields a nice softbox effect by enlarging the light source. The speedlights are triggered via a "Jokie" light barrier.
Post processing in Photoshop: Cloning out some spots, slightest contrast increase, white balance, sharpening.
You wanna try this yourself? Don't do it, it's an incredible mess.
You still want to? Take water instead of cream.
Still want to use cream? Make sure, your partner is not at home! :-)