Avocados do not ripen on the tree; they ripen or “soften” after they have been harvested. To speed up the avocado ripening process we recommend placing unripe avocados in a brown paper bag with an apple or banana for two to three days until they are ripe.
We do not recommend any other method of ripening.
The easiest way to jump start the ripening process is by placing your avocado inside a brown paper bag. This method will trap the ethylene gas that the fruit is emitting and accelerate the ripening process. You’ll see some progress after 24 hours.
You can also try placing another fruit inside the bag – the most commonly used ones are an apple or a banana – to accelerate the process even further since they also produce ethylene gas. You’ll still need to have some patience since only circumstantial evidence suggests that putting fruits together will accelerate the ripening process.
Allow them to get some sunlight
By this same reasoning, a slower yet more natural way of speeding up the ripening process of your avocado is to place it in a fruit bowl next to other fruit, in a spot where it receives some indirect sunlight. If you have several avocados and want to eat them every day of the week, you can stagger them closer or further from the other fruit depending on when you want them to be ready. The closer they are to other fruit the faster they’ll ripen.
What to do if you cut into an avocado and it’s unripe
If you cut open an avocado and discover that it’s still hard and not ready to eat, add a dash of lemon to it. Afterwards, put both halves of the avocado together with the seed inside and place it in a sealed plastic container with a banana or an apple inside. The next day, you might find a wild animal there, or it might work and your avocado will be ripe. If you want to be safe, it’s best to use the unripe avocado in a recipe that doesn’t demand a lot of texture and flavor from the fruit.
Never use microwave or oven
Some avocado enthusiasts believe that placing an avocado in the oven or in the microwave will speed up the ripening process, but this is not true. You might get burned and end up eating a tasteless lump of green. There’s no magical way of tricking nature, and avocados will be ready on their own time.