I didn't really measure any of the ingredients, and making salsa from scratch is so flexible you can really adjust the ingredients to your taste.
Here is what I did, and it turned out to be so good, it didn't even last one meal between the 4 of us.
Fresh Garden Salsa
3-4 fresh tomatoes, seeded and coarsely chopped (blanched and peeled too if you want, but I didn't do it)
1/2 t salt
1 jalapeno, coarsely chopped
1 very small onion, coarsely chopped
1 clove of garlic
bunch of cilantro
a splash or two of lime juice
Seed, peel and chop the tomatoes a couple of hours in advance. Place in a covered bowl and sprinkle with the salt. Refrigerate for a couple of hours to allow the juices to drain.
When ready to prepare, drain the tomatoes. Squeeze the extra juices out if necessary. Combine tomatoes, jalapeno, onion, garlic and cilantro in a food processor and give it a couple of pulses until it has the consistency you want.
Remove to a serving bowl and add the lime juice and serve with chips.