The glass is sitting on a sheet of glass placed on top of a cardboard box. The box has no top and in the bottom of the box is an Elinchrom D-Lite 4 flash head pointing straight up. On either side of the glass are two SB-28's with large soft boxes pushed up close to the glass. Both set to 1/2 power.
Lots of dust removal in Lightroom, but it would have been better if I started with a cleaner glass. Also the lemonade went flat really quickly. If I was going to do this shot again, I would get it all set up and then fill the glass so there were more bubbles.
Setup shot here (although not of this shot): Setup shot
Many thanks to Udi Tirosh for publishing this.