Add the parsley, garlic, jalapeños, salt, and vinegar to a bowl.
Stir until well combined and allow to sit for 5 minutes.
Add the olive oil, then stir again until well combined, and sit at room temperature for 10-15 minutes before serving.
Notes
Cilantro - If you want to combine cilantro and parsley, I would do 1½ cups parsley and a half cup of cilantro so that the cilantro flavor doesn’t overpower the sauce.Consistency - I prefer a chunky sauce, but you can fine-dice the garlic and jalapeños for a smoother texture.