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• X is an acidic liquid produced from the fermentation of ethanol in a process that yields its key ingredient, acetic acid (ethanoic acid).
• The Old Testament of the Bible, it is mentioned as unpleasant to drink. Jesus was offered a mixture of X while on the cross.
• In Islamic traditions, X is one of the four favored condiments of the Prophet Muhammad, who called it a "Blessed seasoning".

Vinegar.