Can an onion help keep your avocado from turning brown? See how it works (2024)

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Can an onion help keep your avocado from turning brown? See how it works? ›

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You can put your avocado half in an airtight container with a sliced onion and refrigerate it. The fumes from the onion slow down the browning process. Your avocado will stay green for at least two days, but it may absorb the onion flavor.

Onions aren't just a tasty addition to guacamole—they're naturally an avocado's BFF: Brown-Fighting Friend, that is. Onions contain sulfur compounds that, when released, slow the oxidation that causes browning. Roughly chop up a red onion, place it in an airtight container, and lay your avocado half on top.

The sulfur compounds in the onion will oxidize on the green surface of the avocado and slow down the browning process for a few more days.

The main goal is to prevent oxygen from touching the avocado's flesh. Plastic wrap is a practical, albeit not foolproof way to slow down the natural course of fruit aging. The trick is to make sure the plastic wrap is sealed flush with the flesh.

"The onion releases sulfur, which keeps your avocado green," she said, explaining the chemical reaction that halts the oxygen from interacting with the enzymes in an avocado.

Easiest Method: Coat with Avocado Oil

We sprayed the surface of a cut avocado with avocado oil olive oil works here, too) before storing in an airtight container in the fridge. Not only was this hack fast and easy, it actually kept the avocado in the best shape through the five-day test.

onions. Onions contain sulfur, which prevents the enzymes in avocados from interacting with the air and turning brown. The easiest way to take advantage of this trick is to cut up some onion, line the bottom of a container, and place the avocado on top with the cut-side up. Then cover and store in the refrigerator.

You can safely eat an avocado or guacamole that has turned brown due to oxidation, just as you could eat an apple that has undergone the same chemical reaction. However, it certainly doesn't look as appetizing when presented on a plate, and the taste may be slightly altered (read: a tad bitter).

It will slow the ripening process significantly.” For times you get a hankerin' for a little sliced avocado on a sammie but can't eat the whole thing, Tomlin suggests storing the cut avocado with the seed intact in an airtight container along with a sliver of an onion.

What is the best and fastest way to ripen avocados? ›

How to Ripen an Avocado Quickly. You can speed up the avocado-ripening process with a piece of fruit. Put an avocado in a paper bag with a banana, an apple or a kiwi and fold to seal. These fruits produce ethylene gas, a plant hormone that aids ripening.

Pour a thin but visible layer of water or lemon/lime juice over the guacamole to form a barrier with the air. Cover the dish with plastic wrap, pushing the wrap, so it is flush with the guacamole to prevent air pockets, or put the guacamole in a sealed tub.

“Each panned guac gets sealed airtight with Saran Wrap,” he said. “Then it gets lidded, labeled and stored for later use. This process ensures freshness and prevents browning,” he continued.

Although brown guacamole isn't the most appealing, it's completely safe to eat (as long as you've stored the guacamole in the refrigerator, and it isn't more than three days old). "While a bit off-putting to look at, brown guacamole is totally safe," confirms Food Network's nutritionist, Dana Angelo White, MS RD ATC.

The method seemed simple enough: You're supposed to submerge whole avocados in cool water in an airtight container and place it in the refrigerator. Leave the container there until you're ready to use. Take it out, dry off the avocados, and enjoy.

Fresh and ready avocado halves are a sight to behold. But they won't stay that way for long. To keep them from turning brown, seal the flesh with a sprinkle of lemon juice, lime juice, or olive oil, then tightly wrap it in plastic wrap and refrigerate.

However, garlic can be stored along with onions without spoiling.