Nectar Drops (floral nectars) are common in flowering plants, secretions that (if I understand it right) provide a nutritional resource for various pollinators. These drops are viscous, which makes them easier to photograph than drops of water, because they don’t just roll off, but remain for a while.
To photograph them, I find that the best lenses are those that are fast and sharp wide open. This allows you to stack or photograph just the nectar drop, allowing the rest of the photo to contrast by falling into bokeh. I like the contrast between the focused drop and the rest mostly bokeh. Here are two examples.
The first shot is with the Nikon D810 and the Voigtlander 125mm f/2.5 APO-Lanthar, stacked with Zerene Stacker.
The second shot (taken some years ago) is the Nikon D3s (I believe) with the Nikkor CRT 55mm f/1.2, stacked with Zerene Stacker.