The Onion

[AnywherebutHere]

Light filters to me through leaves
camouflaging the back fieldI am not sure how this description fits well with the whole slicing of the onion, I had to read it twice to understand it, It seems like filter description to me
as I lean, palms pressed upon cool marble, I think you can do without palms pressed upon cool marble, and go straight to the next line, or add as I lean meticulously over..." or another descriptive word, I don't think you need a whole phrase.
over a spine-broken book of your recipes;

dog-eared, well-thumbed,
inclined agin a rolling pin,
it instructs me
to peel and slice an onion.

Clasping the gleaming orbothers have also pointed this out, this line is trying to hard to be poetic and mysterious, I don't feel like it goes well with the whole vibe of the poem.
worked from earth, my elbow yields
to density, then rebounds
from the board's wooden knell.

I nick and strip it's sere brown skin,
center and split to reveal
two pale discs of morning sun
and eclipsing one, begin to slice.What I see from this stanza is that the onion has split, before you even slice. That is the imagery I got out of this.

My dull blade chaws and stutters I don't think a blade would chaw or stutter
through thick rotations, tearing layers
into one another and releasing
a keen earthy tang

that confronts and quickens
then blurs the senses
with concentrated tears; a furrowing
that needles the very middle of the mind. The concentrating tears I feel does not make sense, or the last line. Your tears can "overflow" or be "uncontrollable" when cutting and onion, maybe consider that when trying to get the feeling of really cutting an onion which most people have done.

But the sting is salved
when I scrape the grey mulch
into smoking oil and it spits and sizzles,
simmering to golden translucent clarity, I feel you can end this with a sentence. I do like the imagery in this however instead of "and it spits" I will suggest "that spits and sizzles"

liberating a sweet-savoury aroma
that stimulates a deeply satisfying
insatiable hunger to understand something
so much simpler and yet more accomplished than I.

I thought overall the poem was good, just needs a bit more work on connecting all the images together so they flow without having to think too hard.