Marshelder or sumpweed.....

A search of the Permies forums did not return any hits for this plant.  Has anyone any experience with processing the seed into anything edible or just tried to extract/prepare oil or protein from it?  The thing seems to have burst forth from a pile of clay that was delivered to our property.  We are on the northern Plains of the US.

Food Use:  https://archaeology.uiowa.edu/marshelder-or-sumpweed

Description: http://minnesotaseasons.com/Plants/giant_sumpweed.html

I tried giving it to chickens and at first they would eat it only if starving to death.   However, chickens raised on it will eat it.   It is high in protein and a good quality feed.

My Nubian goats never allowed it to go to seed, and it died off for me after 5 years.   It was a great feed for them, but my seed source passed on.

The oil it produces has a strong odor and not particularly good taste when used for cooking.   However, to get the oil you grind the seeds in a mortar and pestle then press.   Or at least that is how we did it.  We used the oil in feed finding it too distasteful on the table.  It has a bad odor when heated.

It never made it to our table and was only planted as a high protein food crop for the critters.

If I'm not mistaken, this plant was domesticated independently in North America as a grain along with little barley (Hordeum pusillum), lamb's quarters (Chenopodium berlandieri), erect knotweed (Polygonum erectum), and maygrass (Phalaris caroliniana).
https://www.researchgate.net/publication/318227950_Growing_the_lost_crops_of_eastern_North_America's_original_agricultural_system

To remind, these 'independently developed crops' are similar to other plants.

Little Barley == Barley
Maygrass == Canaryseeds (common birdseed)
Erect Knotweed == Buckwheat
Lamb's quarters == Quinoa
Sumpweed == Ragweed. (Allergy Pollen)