Opson and sitos
Greek side

Opson (Greek: ὄψον) and sitos (σίτος) are an important division in Ancient Greek foodways. Opson is the 'relish' that complements the sitos; sitos is the staple food part of the meal, i.e. grains like wheat or barley, and pulses like chickpeas and fava beans.
Although any kind of complement to the staple, even salt, could be categorized as opson, the term was also commonly used to refer to the most esteemed kind of relish: fish. Hence a diminutive of opson, opsarion (ὀψάριον), provides the modern Greek word for fish: psari (ψάρι). Opson can also be used to mean 'prepared dish' (plural opsa).
Morality
Because it was considered the more pleasurable part of any meal, opson was the subject of some anxiety among ancient Greek moralists, who coined the term opsophagia to describe the vice of those who took too much opson with their sitos. The central focus of Greek personal morality on sophrosyne (approximately, moderation and temperate self-control) made opsophagia a matter of concern for moralists and satirists in the classical period.
The term opsophagos, literally 'opson-eater', is used by classical authors to refer to people who, almost always, are fanatical about seafood, e.g. Philoxenus of Leucas.
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