Cook spaghetti. Drain, rinse, & cool. Rinse with cold water again and drain well.
Add all other ingredients; mix well. Taste and add any salt, pepper, etc. as desired. Adjust and add more tomatoes, green onions, etc. as needed. In the summertime, add some chopped fresh basil and oregano. Let stand at least 2 hrs. (The longer this stands the better, so this can be easily made & refrigerated the night before.)
Optional: Add any chopped meat. Chopped ham is the best.
Note: This recipe makes a lot, but can be easily halved.