Place the avocado on the cutting board, cut it in half, and remove the pit. Scoop the soft green flesh from the skin into a medium-sized mixing bowl.

Use a fork to mash the avocado until it reaches your desired consistency. Some people prefer their guac to be smoother, while others like it to be chunky.

Squeeze the lemon juice into the bowl and add a pinch of salt, cayenne, and cumin. Mix well to incorporate.

Add chopped onion and cilantro, and mix them into the bowl with the Avocado and lemon juice.

Taste your guac and adjust the seasoning as needed. You can add more salt, lemon juice, or other ingredients to get it right.

Enjoy your fresh, homemade guacamole with your favorite tortilla chips in a burrito or whatever you'd like to serve.