This one is pretty simple.
1) Chop your tomatoes, cilantro, garlic, onion, and jalapeño pepper.
2) Squeeze in your lime juice and season with salt and pepper.
3) Add ingredients into a small blender or food processor for 1-2 pulses. You want a little liquid consistency while keeping the chunks of tomato.
And that's all there is to it! I like to refrigerate for 15 minutes or so before serving, but if you make this ahead of time, it keeps perfectly well in the fridge!