Prepare the Avocados: Cut the avocados in half, remove the pit, and scoop the flesh into a medium-sized bowl. Be sure to use ripe avocados for that creamy texture.
Dice the Cucumber: Wash the cucumber, peel it if desired, and dice it into bite-sized pieces.
Slice the Onion: Thinly slice the red onion and add it to the bowl with the avocado and cucumber.
Dress It Up: Squeeze the juice of one lime over the mixture. Season with salt and pepper to taste, adjusting according to your preference.
Mix Gently: Carefully toss everything together to combine, being cautious not to mash the avocado.
Garnish: If you like, sprinkle fresh cilantro on top for an additional burst of flavor.
Serve: Enjoy immediately or chill for a few minutes before serving to let the flavors meld.