鮨 is a traditional Chinese hanzi, listed here under the keyword “seasoned rice mixed with fish or vegetables”. It is built from 魚 (fish) and 旨 (purpose).
On KumiJi Glyph Explorer, open the parts search and type “fish” + “purpose”. 鮨 is among the results, together with every other character containing the same shapes.
Open 鮨 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.