Finally, leave it up to taste. Leftover sushi, especially with rice, changes slightly in texture when it's chilled. It might not be a game changer but, in the long, run your tastebuds may decide ...

According to Northcutt, the biggest factor is rice's acidity or basicity, also referred to as pH. Some restaurants—particularly sushi restaurants—mix rice with vinegar, lowering its pH ...

Some delicious dishes just don't make for reliable leftovers, though, including sushi. Most types are made with vinegared rice, nori seaweed, and raw fish (or even different types of fish eggs).