Leave the pit in the unused half
Brush or sprinkle the cut surface with lemon or lime juice
Coat the cut surface lightly with olive oil
Wrap tightly with plastic wrap, pressing it directly onto the flesh
Store in an airtight container
Keep the avocado cold in the refrigerator
Use a vacuum-sealed container if available
Minimize exposure to air
Cut only what you plan to use
Add onion slices to the storage container
Mash with citrus juice if making guacamole
Cover the exposed flesh with water briefly before refrigerating