(Musubi / Mukupī) A food such as meat tied to a block of rice with nori, a type of seaweed. It differs from sushi in that the rice is not vinegared.
Seems like "A musubi for me please." should be accepted.
My prompt said "o'okahi" so I thought it was a definite quantity being specified.
"One musuibi for me please" Accepted 10/25/2020