I was somewhere over the Pacific Northwest, laptop open at thirty thousand feet, when a fun paper dropped into my in box. Published in PLoS One just days earlier, it described the chemical and microscopic analysis of burnt food deposits on pottery vessels from prehistoric sites scattered across Northern and Eastern Europe — the Upper Volga, the Don River basin, the Baltic coast. The researchers, led by Lara González Carretero at the University of York, had scraped the carbonized residue from the bottoms of eight-thousand-year-old pots and looked inside with scanning electron microscopes. What they found wasn’t just food. It was cuisine.

Guelder rose berries deliberately combined with freshwater fish. Goosefoot and saltbush greens stewed with cyprinids. Wild grass seeds and legumes mixed in specific proportions that varied by region and culture. The researchers used the word selective — these hunter-gatherer-fishers were not simply throwing whatever was at hand into a pot. They were making choices. They had recipes.

I sat back and thought about manzanita cider.

For most of a decade in the 1980s and into the 1990s, I taught occasional weekend field courses at the James San Jacinto Mountains Reserve, the UC field station I directed in the mountains above Palm Springs. Two courses in particular have stayed with me across the decades: an introduction to outdoor survival skills, and a survey of edible and useful plants of the desert and mountains. The students who arrived Friday afternoon were mostly adults returning for personal enrichment or needing credits towards a graduate degree. And others might simple be naturalists — people who spent their professional lives outdoors but had rarely thought seriously about eating from it. By Sunday they were different. Not because I had taught them to survive, exactly, but because I had taught them to read.

The curriculum was organized around the principle that plant knowledge is landscape knowledge. You cannot learn edible plants from a book any more than you can learn bird song from a spectrogram. You have to be in a place, moving through it at the right season, attending to the right details — the color of a berry cluster in September light, the smell of crushed leaves, the way certain roots swell near water. The San Jacinto Mountains offered an extraordinary classroom: the reserve sits at the intersection of chaparral, yellow pine forest, and the upper edge of Sonoran desert influence, a transitional zone of exceptional botanical richness. Within a few miles of elevation you could move from desert agave and chia to black oak and elderberry, encountering dozens of species that indigenous peoples of the region had known and used for thousands of years.

The course always ended with an evening feast, and it was always the same menu. We made manzanita berry cider — cold-soaking crushed Arctostaphylos berries to extract their sharp, malic acid bite, a drink that tasted unmistakably of place. We prepared chia seeds (Salvia columbariae), which the Cahuilla people of the region had harvested in enormous quantities, grinding them into a protein-rich paste or drinking them whole in water, the seeds swelling into a mucilaginous gel that kept people hydrated and sustained on long desert crossings. We pounded cattail (Typha) rhizomes harvested from the marsh at the lower end of the reserve, washing out the starch through repeated soaking until we had a fine flour that we mixed with acorn meal — the latter leached of its bitter tannins through the slow, patient process that California Indians had practiced for millennia. From these ingredients we made pancakes, cooked on a flat stone over coals.

They were, by any objective standard, delicious.

What González Carretero and her colleagues recovered from those ancient pots is the archaeological shadow of exactly this kind of knowledge — not survival in the emergency sense, but cuisine in the cultural sense. The distinction matters enormously. Emergency subsistence is what you do when the grocery store is gone and you are desperate. Cuisine is what a people builds over generations of intimate relationship with a specific landscape: the knowledge of which plants are worth gathering in which seasons, which combinations improve palatability, which preparations detoxify mildly poisonous foods into something nourishing. The researchers noted that guelder rose berries (Viburnum opulus) are mildly toxic when eaten raw, with a bitter taste and a pungent cooking smell — yet communities across the Upper Volga and Baltic were deliberately combining them with freshwater fish, a preparation that made them both palatable and nutritious. That is not improvisation. That is accumulated wisdom, tested and refined across many generations.

I am writing these words on my way to Anza-Borrego Desert State Park in southern California, and the convergence feels almost too neat. Anza-Borrego sits at the heart of the traditional territory of the Cahuilla, Kumeyaay, and Cupeño peoples, and it is one of the most intensively studied ethnobotanical landscapes in North America. The archaeological record here extends back more than ten thousand years and documents a relationship between people and desert plants of extraordinary sophistication. Mesquite pods ground into sweet flour. Desert agave hearts roasted for days in stone-lined pits, their starches converted by long heat into digestible sugars. Ironwood seeds parched and ground. Cholla cactus buds harvested in spring at the precise moment of peak nutrition. Pinyon pine nuts collected in the mountains above the desert floor. This was not a people scratching a marginal existence from an inhospitable landscape. This was a civilization with a cuisine, adapted over millennia to one of the most demanding environments on earth.

I find myself thinking about all of this with a new urgency that I did not feel when I was teaching those courses forty years ago. The world was already changing then, but the pace was slower, the alarm more distant. Now the projections are stark: climate disruption, water scarcity, soil degradation, and the cascading fragility of industrial food systems that feed eight billion people through supply chains of terrifying complexity and thinness. The question of where food comes from — really comes from, at the level of soil and seed and seasonal knowledge — has moved from the curriculum of weekend naturalist courses into something approaching civilizational concern.

And here is what troubles me: we have spent the last century systematically dismantling exactly the kind of knowledge that González Carretero’s foragers carried in their hands and in their pots. The ethnobotanical traditions of the Cahuilla, documented painstakingly by researchers like Edward Spicer and Lowell Bean in the twentieth century, represent knowledge systems that took thousands of years to build and a few generations to erode. My manzanita cider and acorn pancakes were a weekend gesture toward something that was once a complete way of knowing and feeding a community. The students who attended those courses left with a few skills and a changed relationship to the plants around them. But they did not leave with the deep, embodied, intergenerational knowledge that the Cahuilla elder knew, or that the Upper Volga forager expressed in the careful selection of goosefoot stems and Viburnum berries for the evening pot.

The González Carretero paper makes one finding that I keep returning to. When the researchers compared their microscopic results against the standard lipid residue analysis that archaeologists normally use to study ancient cookware, they found almost no overlap. The fat-based chemistry that dominates most pottery analysis is essentially blind to plants — it picks up fish and animal fat and dairy, but the plant ingredients that microscopy revealed so clearly left almost no chemical trace. The authors concluded that our knowledge of hunter-gatherer plant use has been grossly underestimated simply because our analytical tools were biased toward animal products.

I wonder if something similar is true of our cultural moment. We have tools — economic, agricultural, technological — that are exquisitely calibrated for the industrial food system we have built. But those tools are largely blind to the plant knowledge that sustained human communities for tens of thousands of years before agriculture, and that sustained indigenous peoples in places like Anza-Borrego long after it. That knowledge is not gone — it persists in communities, in researchers, in the curriculum of weekend field courses taught by ecologists who cared enough to make acorn pancakes. But it is no longer in the pot, so to speak. It no longer shapes how most people in industrial societies think about food, landscape, or survival.

In a few hours I will be walking through desert scrub in the warm March light, watching for the first chia in bloom, noting the mesquite beginning to leaf. The Cahuilla read this landscape the way González Carretero reads a foodcrust — with patient attention, trained eyes, and the accumulated knowledge of people who came before. There is something the pot remembers that we are only beginning to recover. We may need it sooner than we think.