Halve the avocados and remove the pit. Scoop the flesh out and mash through wire mesh or mash with a fork.
Add the lime juice, onion, cilantro, black pepper and 1/2 tsp. of the salt. Stir gently until combined. Taste for salt and lime juice. If desired, add another 1/2 tsp. of salt.
If you like a spicy guacamole you can mince up a fresh jalapeno and add some or all of that. Include the seeds for the most spicy option. Remember, as your guacamole sits this will get hotter and hotter so use wisdom.
Refrigerate flooded with water until ready to serve.