Wash and chop the tomatoes into small pieces.
Finely chop the onion and jalapeño pepper.
Rinse the cilantro and chop it roughly.
In a mixing bowl, combine the diced tomatoes, onion, and jalapeño.
Add the chopped cilantro to the bowl.
Squeeze the juice of one lime over the mixture.
Sprinkle salt and pepper to taste.
If using, add garlic powder for extra flavor.
Mix all ingredients thoroughly until well combined.
Taste and adjust seasoning if necessary, then serve immediately or refrigerate for later use.