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We are making some rolls and want to put them in the fridge and eat them tomorrow. We will of course wrap them very well but we have a question regarding Avocado rolls.

Is there any tip to avoi the avocado turning black or darkening?

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up vote 4 down vote accepted

You can try dipping it into acidulated water (water with acid added, either lemon juice or vinegar, or even a powdered vitamin c tablet). This should delay the browning, but I am not sure it will last long enough to hold the rolls overnight.

You will have the additional problem that the nori will begin to soften overnight.

See also: What's the best way to keep sushi fresh for the following day?

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That and the rice will dry out rapidly – Yamikuronue Oct 11 '13 at 16:27
Sometimes you can keep the rice more moist by making your sushi-su more syrupy. Kind of creates a new problem to solve an old one though... – SourDoh Oct 11 '13 at 16:56

Placing whole avocado (with intact skins) in a water bath at 43°C for a couple of hours will deactivate the enzyme that causes browning.

See Avocado Tests

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This seems like a very poor idea; it is essentially incubating the food in the danger zone (110 F) for several hours. While vegetables are not typically high risk foods, avocado are very fatty. – SAJ14SAJ Oct 11 '13 at 18:23
Not a poor idea at all....see the following, for example. – moscafj Oct 11 '13 at 19:00

Ditto the suggestions on dipping the avocado slices in some sort of citric acid. But trying to hold the rolls isn't the best idea. As stated, the nori will become soft, the avocado with brown and turn mushy and the rice will dry out. If you insist on holding it try this method. Wrap the entire cylindrical roll tightly (no air) in plastic wrap, store in the fridge, then unwrap and slice them up right before serving. You might want to consider omitting the avocado.

Best of luck to you!

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