Hold the bouquet of parsley by the stems and remove (shave off) parsley leaves. Then coarsely chop.
In a food processor, add parsley and garlic, process until finely chopped.
Add olive oil, red wine vinegar, oregano, red pepper flakes and salt. Give a few pulses just to combine until chunky sauce forms.
Let chimichurri sauce stand for 15 minutes. Serve with grilled meat or chicken, or use as a marinade.
Notes
Store: Refrigerate in an airtight container for 1 - 2 weeks. It will solidify, to warm up microwave for a few seconds or place jar in a bowl with hot water for 10 minutes.