Grapok sauce, basically Klingon ketchup. Great on bregit lung.
So what is the bottle? I’ve been racking my brains for a few years on this. At first I was thinking a water bottle, but the more I look it over, it could be a glass bottle or vase. I had a few more pics but I may have lost them when my HD crapped on me. There used to be a video of Penny Juday talking about the props, she doesn’t go into much detail on this prop, other than I think she refereed to it as “Klingon mustard”. Here’s the only shot I have of the bottle from that video.