Jews do not eat pig. This (not always true) observation has been made by both Jews and non-Jews for more than three thousand years and is rooted in biblical law. Though the Torah prohibits eating pig meat, it is not singled out more than other food prohibitions. Horses, rabbits, squirrels, and even vultures, while also not kosher, do not inspire the same level of revulsion for Jews as the pig. The pig has become a symbol for people to signal their Jewishness, non-Jewishness, or rebellion from Judaism. Starting with the Hebrew Bible, Jordan D. Rosenblum historicizes the emergence of the pig as a key symbol of Jewish identity, from the Roman persecution of ancient rabbis, to the Spanish Inquisition, to Shakespeare's writings, to modern memoirs of those leaving Orthodox Judaism. The pig appears in debates about Jewish emancipation in eighteenth-century England and in vaccine conspiracies; in World War II rallying cries, when many American Jewish soldiers were "eating ham for Uncle Sam;" and in recent deliberations about the kosher status of Impossible Pork. All told, there is a rich and varied story about the associations of Jews and pigs over time, both emerging from within Judaism and imposed on Jews by others. Expansive yet accessible, Forbidden offers a captivating look into Jewish history and identity through the lens of the pig.