Prepare the Avocados: Slice the avocados in half, remove the pits, and scoop the flesh into a medium bowl.
Mash the Avocados: Mash the avocados with a fork or potato masher until they reach your desired consistency (chunky or smooth).
Add Lime Juice and Seasonings: Stir in the lime juice, salt, and black pepper to enhance the flavor.
Mix in the Add-Ins: Add the red onion, tomato, jalapeño (if using), cilantro, and garlic (if using). Mix gently to combine.
Taste and Adjust: Taste the guacamole and adjust the seasoning with more lime juice or salt, if needed.
Serve: Transfer the guacamole to a serving bowl and enjoy immediately with tortilla chips, tacos, or as a side to your favorite Mexican dishes.