Cut the avocados in half, remove the pits, and scoop the flesh into a bowl.
Mash the avocados with a fork until you reach your desired consistency.
Stir in the diced onion, jalapeño, garlic, and tomato.
Add the lime juice, chopped cilantro, salt, and cumin. Mix well.
Taste and adjust seasoning as needed.
Serve immediately or cover with plastic wrap and refrigerate until ready to serve.