Onion Storage Hack Extends Avocado Freshness in the Fridge
Avocados are notorious for turning brown rapidly when refrigerated, but a simple storage technique involving one common vegetable could significantly prolong their shelf life. This nutritious fruit, rich in fibre, healthy fats, and nearly 20 vitamins and minerals, offers benefits for heart health by reducing "bad" cholesterol, supporting eye function, and aiding weight management.
However, once cut, avocados undergo oxidation—a chemical reaction between air and enzymes—causing the flesh to discolour quickly. While brown avocado is safe to eat if it lacks a foul odour, its unappealing appearance often leads to waste.
Red Onion Magic for Avocado Preservation
In a viral Instagram video, health and fitness coach Jessica Goh demonstrated that storing cut avocado in an airtight container with red onion prevents browning. She exclaimed, "If there's one kitchen hack that makes me happy every single time, it's keeping your avocado fresh and non-brown with red onion. I cut this in half yesterday, and it's absolutely fine—it's magic!"
Cookbook author Nicole Keshishian Modic previously shared this trick on Good Morning America in 2023, explaining that onions release sulphur, which inhibits oxygen from interacting with avocado enzymes. A potential downside is a slight onion flavour transfer, which may be unnoticeable in dishes like guacamole but could affect other recipes.
Social Media Enthusiasm for the Hack
Commenters on Jessica's video expressed gratitude and eagerness to try the method. One user remarked, "I'm shook! I've literally bought avocados today as well," while another added, "I didn't know this! I'll definitely be trying it." A third praised, "You're right, it is magic."
Comprehensive Avocado Storage Guide
Storing Whole Avocados (Uncut)
- If unripe (hard and bright green): Keep at room temperature until it yields to gentle pressure.
- To accelerate ripening: Place in a paper bag with a banana or apple for one to two days; these fruits emit ethylene gas that speeds up the process.
- If ripe (soft to touch): Refrigerate to slow ripening and gain extra days of freshness.
Storing Cut Avocados
- Retain the stone if possible: It reduces browning on the covered section.
- Apply an acid barrier: Brush or sprinkle lemon or lime juice or vinegar on the cut surface to slow oxidation.
- Seal airtight: Use cling film pressed directly onto the flesh or an airtight container with minimal air.
- Refrigerate immediately: Never leave cut avocado on the counter.
Identifying Spoiled Avocados
- Light browning is normal: Scrape off discoloured layers if the smell is fine.
- Discard if: It emits a sour or off odour, shows widespread mould, or has dark, grey, slimy flesh with an unpleasant taste.
