I’m reading this manga and I came across this scene that the character is describing the new member of the school team that
*Note: 音駒 is the highschool name.
For ひと匙, I’m assuming the character is implying that this new member is one last piece (or thing; factor; component) that the team has sought after. However, after I have done some research online, I could not find any examples of 匙【さじ】 with such usage. (Most examples I found are related to cooking recipe, which was not surprising because of its original meaning of spoon.)
Therefore, I’m curious if my understanding is correct? If yes, has the term been used colloquially?