Wild Lupine and Karner Blue Butterflies (1996) [pdf]
nrc.gov
nrc.gov
For example, I have seen various lupine tempe brands, and in Germany I can get lupine "coffee" (it's not quite the same but tasty on its own terms, and I need to avoid caffeine).
However it is a very beautiful plant and the flowers are good for insects like butterflies!
It should not be confused with another blueish colored lupine that came here from North America and is considered one of the most problematic invasive species. Lupinus polyphyllus.
https://books.google.com.au/books?id=QdSfb9_fXssC&pg=RA4-PA7...