This is a section of the outermost layer that I carefully peeled away from a yellow onion. The magnification ratio is about 1:1.9, which means the scene being captured is just slightly less than twice as large as my APS-C sensor. The saturation was not increased during post-processing.
Setup
The background is a relatively distant black carpet on the floor. A flash light is on the right side and behind the subject shining through the translucent onion skin.