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.

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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.

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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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