Finely chop 1/2 cup fresh parsley
Finely chop 1/4 cup fresh cilantro (optional)
Mince 2–4 cloves garlic
Finely chop 1 small red onion (or 2–3 tbsp)
Finely chop 1–2 jalapeños or serrano peppers (optional)
Add 1 tsp dried oregano
Add 1/2 tsp kosher salt (or to taste)
Add 1/4 tsp black pepper (or to taste)
Add 1/2 cup extra-virgin olive oil
Add 1/4 cup red wine vinegar (or to taste)
Stir until well combined
Let sit 15–30 minutes before serving (optional)
Taste and adjust salt, pepper, vinegar, and oil as needed