Put everything in a blender or food processor and pulse or blend until it's the consistency you like. I usually leave it a bit chunky for dipping,
or you can just chop everything up and mix with a spoon.

Can be used immediately, but it gets better with time. Great as a dip with  tortilla chips or use it to spice up other dishes.

This salsa is infinitely modifiable. Just play with it!
A few ideas:
You can add or subtract different peppers, seeded or whole, roasted and skinned or not.
Garlic and tomatoes can be roasted or not.
Tomatoes can be canned or fresh.
You can substitute tomato sauce for all of the tomatoes or vice-versa.
Add a touch of cilantro or oregano.
A pinch (or more) of ground black pepper.