Yummy Groceries

The seed shown is that of a peach (Prunus persica, formerly Persica vulgaris). The peach seed (or pit) contains amygdalin, a compound that gets broken down into cyanide by the enzymes in the human gut, so it’s not a good idea to grind them up and eat them. Apple, cherry, and apricot seeds also contain amygdalin.

The image in the comic is based on the illustration on Plate 321 of the book Flora von Deutschland, Österreich und der Schweiz (1905) by Otto Wilhelm Thomé (1840–1925). (That book is available online at BioLib.de.)