The cabinet under the kitchen sink is a highly neglected area.
This is the area that we shove highly noxious cleaners and surfactants. Many people even have garbage cans under their sinks. For me, the soap and cleaners are no exception however I do not keep any garbage under my sink. In fact I keep a tub to collect some of the best stuff that my household produces.
The tub holds all kinds of material that is just full of macro and micro nutrients. It is organic, all natural and when I take it to it's place of magic, outside, it is just teeming with molds, fungus and all sorts of wiggling organisms doing their part to better my life.
The tub is a significant part of the process however the real magic does not happen till it goes outside. Once the tub's payload is delivered the previously mentioned critters go to work. Through (hopefully) aerobic bacterial action the complex materials are consumed and wastes are excreted. Sounds gross but it is actually exactly what I want!
Once most of the available complex materials are consumed most of the micro organisms die. Sad, but it is an integral part of the process, and their death releases tons of Nitrogen, Phosphorus, and Potassium as well as all sorts of other trace elements that are ready and waiting for the lucky plants that get to grow their roots in to the piles of decomposed micro organisms.
If you haven't figured it out yet, I am talking about the lowly compost pile. It begins as a pile of food debris under my kitchen sink but ends up feeding my plants what they need to grow happy and healthy.