Wash hands with soap and water for 20 seconds.
Wash the produce under cold running water.
Juice the lemon; set aside.
Chop the cilantro, tomato, pepper,s and onion; set aside.
Mash the avocado and lemon juice with a fork until creamy.
Add the chopped cilantro, tomato, peppers, and onion to the avocado mash.
Mix well and season with salt and pepper to taste.
Allow to chill for 1 hour before serving so the flavors mix.