Happy is said to be the family which can eat onions together. They are, for the time being, separate, from the world, and have a harmony of aspiration.

Warner uses a homely, slightly comic image—family members eating onions, with their strong smell and aftereffects—to suggest a deeper truth about intimacy. If a household can share something that makes them temporarily “unfit” for polite society, they are united by trust and mutual acceptance rather than by appearances. The onion becomes a test of solidarity: those who eat it together enter a small, self-contained world where no one is embarrassed before outsiders, and where shared tastes and tolerances create “harmony of aspiration.” The line also hints at Warner’s satirical eye for social convention, implying that much of “the world” is governed by superficial proprieties that close-knit families can, at times, happily ignore.