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Lean burn vs rich burn are two different types of fule/oxygen mix scenarios for engines...maybe a reference to that? Rich burn is when just enough oxygen is provided for 100% fuel burn. Lean burn is when an excess amount of oxygen is provided.
https://www.gallois.be/ggmagazine_2013/gg_04_07_2013_148.pdf
"While lean‐burn gas engines are usually more
economical and powerful and operate at higher
loads, rich‐burn engines can achieve lower
emission levels with a single after treatment
and show a higher flexibility regarding transient
loads and ambient conditions"
Stonehedge
@Emyr
Scott Manley described the green flame on landing as an "engine-rich burn". Ouch.