Gather all fresh ingredients: tomatoes, onion, jalapeños, cilantro, and lime.
Dice the tomatoes into small cubes and place them in a mixing bowl.
Finely chop the red onion and add it to the bowl with the tomatoes.
Mince the jalapeños, adjusting the amount based on your spice tolerance.
Add the minced jalapeños to the bowl.
Chop the fresh cilantro and stir it into the mixture.
Pour in the lime juice, ensuring all ingredients are coated.
Season with salt to taste, and add garlic powder if desired.
Gently mix all ingredients until well combined.
Optionally, fold in diced avocado for creaminess.