Half or even just a fourth is typically filling enough.
(Unless youre making guac.)
One way to prevent an avocado from browning is to pair it with an onion, she says.

Seems simple, right?
Well, when avocado flesh is exposed to oxygen in the air, a chain reaction called oxidation occurs.
This reactiondeteriorates the quality of the avocado and makes it ripen and age faster, causing brown spots.

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(This happens with a lot of other foods, including apples and bananas.)
However, onions contain sulfur, which slow the oxidation that causes browning, says Amidor.
Think of the sulfur as a protective shield that helps your avos stay green and gorgeous for longer.

Then, store it in the fridge.
The onion should give your avocado a couple extra days of life.
That way, youre protecting it as much as possible from the oxygen exposure that leads to browning.

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