Remove the seeds from the tomatoes and cube. Dice the onion.
Cut the jalapeño pepper in half then use a teaspoon to remove the seeds, Finely dice. (Leave the seeds in for a spicier flavor.) Chop the cilantro and mince the garlic.
Transfer avocado, tomato, onion, cilantro, lime juice, minced garlic, garlic salt, lemon pepper and ground cumin to a large bowl. Stir and toss to combine.
Make Ahead: Salsa can be made up to 3 days ahead. Press a piece of plastic wrap directly on top then store in an airtight container and refrigerate.
Notes
Cilantro - If you have an aversion to the flavor of cilantro, you can use parsley instead.
Peppers - Amp up the heat using a variety of chiles such as serrano pepper or diced poblano pepper. Likewise, for a milder flavor use bell peppers.
Tomatoes - You could replace some of the tomato with tomatillos.
Vegetables - You could add corn to the mix for a sweet to balance the heat.
Onions - You can use white onion or a sweet onion like a Vidalia onion, in place of red onion.
Lime Juice - You could use lemon juice in place of lime juice, in a pinch.
Texture - You may choose to mash some of the avocados for a creamier texture. Simply add some of the avocado to a blender or a food processor and process it until the desired consistency is reached.