In a large bowl, combine diced tomatoes, avocados, and red onion, stirring gently to avoid mashing the avocado.
Add the chopped cilantro, minced garlic, and jalapeño pepper to the bowl and mix carefully.
Drizzle lime juice over the mixture and season with salt and black pepper, then toss gently to combine all ingredients.
Taste and adjust seasoning as needed, adding more salt or lime juice if desired.
Let the salsa rest for 15-30 minutes at room temperature to allow flavors to meld before serving with tortilla chips.