Remove and discard stems from parsley, cilantro and oregano. Finely chop all herbs and place into a bowl.
Remove and discard ends of green onion, then finely slice the onion using both white and green parts. Add to bowl with fresh herbs.
With the side of your knife, smash each garlic clove and then use knife to finely mince garlic. Add to bowl with herbs and onion.
Remove seeds and stem from chile pepper and slice into thin strips. Turn pepper crosswise and finely mince, then add to bowl with other ingredients.
Add vinegar, lemon juice, seasonings and olive oil to same bowl. Stir to combine and let sit at room temperature for at least an hour prior to using or cover and refrigerate until ready to use.
Food Processor method:
Using a food processor, combine parsley, cilantro, oregano, garlic and green onions in a food processor and pulse several times to chop fine. Carefully scrape out of processor and place in a bowl.
Remove seeds and stem from chile pepper and slice into thin strips. Turn crosswise and finely mince, then add to bowl with other ingredients.
Add vinegar, lemon juice, seasonings and olive oil to bowl. Stir to combine and let sit at room temperature for at least an hour prior to using or cover and refrigerate.
Notes
Will keep up to 3 days if refrigerated in a sealed container.