Chop your tomatoes into 1/4 inch cubes and throw in a mixing bowl
Dice your green onions...
...White onions
...and jalepeno
Mince the garlic...
...and chop the cilantro
Dump everything into the bowl and stir together
Add the salt and pepper.
and squeeze the lemon and (optional) lime juice. Stir it all together for about a minute, as you stir you should see the juices coming out.
I've noticed depending on the tomato you may need to add a little more salt. taste your salsa and if it seems a little on the sweet side go ahead and give it a little more salt.