While you technically can eat brown guacamole, it may not taste very good and may also be a sign that the guacamole is past its prime. When avocados are exposed to air, they will start to turn brown due to oxidation, which can cause the guacamole to have a bitter taste and a mushy texture. It’s best to eat guacamole when it is fresh and bright green, or if you have leftover guacamole, you can store it in an airtight container with a layer of plastic wrap pressed against the surface to prevent it from browning. If your guacamole has turned brown and has been sitting out for more than two hours, it’s safer to discard it to avoid any potential foodborne illnesses. are avocados typically used in cooking? Avocados are very versatile and can be used in many different dishes, such as guacamole, salads, sandwiches, and smoothies. They can also be used as a substitute for butter or oil in baking recipes.