What residue from the black skin of black salsify must be removed and historically caused inconvenience for consumers?
Answer
Sticky, milky sap
The preparation of black salsify is complicated by its dark exterior skin, which must be removed. This tough, inedible skin harbors a sticky, milky sap residue. This residue is problematic because it has the tendency to stain the hands of the person preparing the vegetable. This inconvenience has historically been cited as a contributing factor preventing the root from achieving widespread popularity in broader culinary application.
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