Organisms in food deposits
It seems like Euglena but I need more parameters than what you have provided.


(source: eastmarinedrive.com)  

https://www.youtube.com/watch?v=ZHZZKwrYm4g

you can narrow it down by this:

http://goo.gl/XTEZ7S

Or 

You can find them in commonly found microorganism in kitchen:

http://www.colorado.edu/eeb/EEBprojects/FiererLab/Flores_etal_2012_kitchens.pdf

Or

http://www.plosone.org/article/info:doi/10.1371/journal.pone.0078866.t001/largerimage

Source: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0078866