User blog comment:JK55556/Next Papa's Game/@comment-27181220-20150927160942

I'm inclined to answer this, but to be honest I'm not exactly sure. In one of the Quinn's Q&A blog posts, Flipline has a direct quote confirming that they have a list of foods which they try to make into future Gamerias.

Source: http://www.flipline.com/blog/archives/3430

I think sushi is quite possibly on the list.

We don't know.