I usually cut up an avocado for meal prep but it turns brown by the next day even when I wrap it tightly. I've tried lemon juice and plastic wrap but it still oxidizes. Is there a better method that actually works?
The lemon juice thing works, but you need actual contact with the cut surfaces - just wrapping it doesn't cut it. What actually stops browning is storing it in an airtight container submerged in water, which sounds weird but keeps oxygen away from the flesh. Another approach that people swear by is leaving the pit in if you're only cutting the avocado in half, then wrapping it tightly. If you're prepping sliced avocado, coat it generously with lemon or lime juice, layer it flat in a container with plastic wrap directly touching the surface, and keep it sealed - the key is minimizing air exposure, not just wrapping the outside.
Water storage works great, but honestly the real trick is making sure the pit stays in there if you haven't used the whole avocado yet 🥑 The pit releases compounds that slow browning, so leaving it in contact with the flesh makes a huge difference. If you've already cut it up, submerging the pieces in water in an airtight container will buy you a solid extra day or two compared to just wrapping it.
The pit method works but honestly cutting it in half and storing each half separately with the pit still in it buys you the most time. If you've already cut it up though, press plastic wrap directly onto the flesh itself (not just over the container) so there's zero air exposure, then add a thin layer of olive oil on top before sealing it all up - the oil creates a barrier that water and lemon juice alone can't match, and it doesn't really taste bad either.
The main thing you're doing wrong is assuming that wrapping alone will stop oxidation. It won't. The brown stuff happens from exposure to air, and just trapping the avocado in plastic doesn't actually seal out oxygen from the cut surfaces - there's still plenty of air in there with the fruit.
What actually worked for me was combining a couple methods. I started storing my cut avocado pieces in a small airtight container with a bit of olive oil coating the surfaces. The oil creates a barrier that oxygen can't get through as easily, and it's way more effective than just lemon juice sitting on top. You still get that citrus flavor if you want it, but the oil is doing the heavy lifting. I'll also throw in a piece of the pit if I've got it - sounds weird but it genuinely does slow things down.
The water submersion people mentioned is legit too, but honestly oil works better for meal prep since you don't have to dry everything off before eating. I've had avocado slices stay decent for a solid 24-36 hours this way, sometimes longer depending on how fresh they started. Just make sure whatever container you use actually seals tight - doesn't need to be fancy, even a regular plastic tub with a lid works fine.
Submerging the cut pieces in water works because it blocks air contact, but if you want them ready-to-eat for meal prep, try pressing plastic wrap directly onto the exposed flesh (not just over the container) and store it in the coldest part of your fridge - the temperature slowdown matters more than people realize. I've also had decent luck with a thin coating of olive oil on the cut surface before wrapping, since the oil creates a moisture barrier that lemon juice alone doesn't.
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