Cut 3 avocados in half lengthwise, remove pits, scrape the flesh of the avocado out with a spoon.
Place in a medium bowl with a flat bottom and mash avocados with a potato masher to a chunky consistency.
Squeeze 3 Tbsp of fresh lime juice directly over avocados while prepping the rest of your ingredients.
Add diced tomatoes, onion, and chopped cilantro.
Season with 1/2 tsp salt and 1/4 tsp black pepper. Stir just until combined and serve.