expression
sashimi garnish
Refers to the shredded daikon, shiso leaves, or other decorative garnishes served alongside sashimi. Literal culinary term.
刺身のつまの大根も全部食べます。
I eat all the daikon garnish that comes with the sashimi too.
expression
something insignificant; something easily dispensable
Figurative use derived from the garnish being secondary to the main dish. Often used in the phrase 刺身のつまのように扱う (to treat as trivial).
彼は会議で刺身のつま扱いされた。
He was treated as if he didn't matter at the meeting.
そんな意見は刺身のつまだ。
That opinion is of no consequence.