One easy way to celebrate the day is by cutting root vegetables cut into cubes, also known as squares, and throwing them into a stew to make Square Root Stew.

This May marks the only time a calendar has a Square Root Day in a 20-year span, with the last one being on April 4, 2016.

Square Root's food requires explanation. That is one of the operating principles at the astonishing, inscrutable restaurant in the Lower Garden District. Its kitchen literally was built so that ...