Outer wrapping is
齐 (even / uniform — the Kangxi #210 indexing radical), supplying both the radical and the sound (qí → jī, regular palatal shift). Inner element is a contracted form historically derived from
韭 (leek), the prototypical condiment chopped fine. Together: 'leek chopped to an even fineness' = the classical minced-pickle dish. The traditional form
齏 shows the structure more fully; modern simplified
齑 contracts the inner element.