When selecting an avocado look for one that is large all around and larger on one end. The skin should be nearly black. Gently cup the whole avocado and gently squeeze. It should be firm with a slight softness. If you can squeeze and make a dent then the avocado is too ripe. Don't accept any that have soft spots, dents, or other markings.
You can buy a greener, harder avocado and let it sit on the counter for a couple of days to ripen.
Source: Experience has shown me how to buy an avocado. I love avocados in sandwiches, guacamole, salads, and dressings.
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