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To crush Kernza, a roller mill designed for wheat and barley must be cranked all the way down to its tightest setting.

This problem all started with the invention of the industrial roller mill in the 1850s.

But, unlike stone flour mills, which crushed the wheat but kept all the parts of the grain together, the roller mill removed the germ, bran, and pretty much all of the nutrients.

Within the industry, there are stories of "drive-by stone milling" where a stone hangs above the industrial roller mill as milled flour flows by.

Now located in Wantage, in Oxfordshire, the mill is electric powered and operates on a secondhand 1940s roller mill installed by her grandfather.