Eight dry quarts of peppers or two gallons of peppers make up a peck. The Mother Goose nursery rhyme “Peter Piper” is where most people first heard the phrase “peck of peppers.”
A peck is a volume measurement unit used in the American Customary and British Imperial Systems. At first, flour was measured using it. One bushel is equal to four pecks in the United Kingdom. “Peter Piper picked a peck of pickled peppers./ A peck of peppers Peter Piper picked.
If Peter Piper picked a peck of peppers,/ Where’s the peck of peppers that Peter Piper picked,” is a popular rendition of the nursery rhyme that gave rise to the expression “peck of peppers.”