Cut the avocados in half, remove the pits, and scoop the flesh into a medium bowl.
Add lime juice to the avocado and gently toss to coat, preventing browning.
Add salt, onion, cilantro, tomatoes, jalapeño, and garlic to the avocado mixture.
Mash everything together with a fork or potato masher, leaving some chunks for texture.
Stir in cayenne pepper for a subtle heat and adjust seasoning to taste.