How To Keep Used Avocado Fresh?

When you only need half an avocado, but found the other half always turns brown even when its kept in the fridge, try keeping the unused portion with the seed un-removed. That way, it will keep the avocado fresh. Drizzle fresh lemon juice over avocado will help as well. Even if you some left over avocado salads, keep the seed and store it together with your salad in the fridge, the seed will keep the avocado green rather than turning brown.