Finely chop the cilantro, parsley and oregano and add them to a small bowl.
Mince the garlic and chili and add them to the herbs.
Stir in the olive oil, vinegar and salt, if using.
Let the sauce rest at least 30 minutes before serving.
Notes
Swap the red wine vinegar for apple cider vinegar, white wine vinegar or lemon juice. Use 1 teaspoon red pepper flakes in place of the fresh chili. Refrigerate up to a week or freeze in an ice cube tray up to 3 months.