Place all ingredients, except red pepper flakes, into a mini food chopper or food processor and pulse 2-3 times for 2 seconds at a time. You just want everything to come together, you don’t want it to look like thin paste.
Remove mixture from the chopper to a bowl. Stir in the red pepper flakes.
White wine or red wine vinegar can be used for this recipe. Red wine vinegar is bolder and stronger than white wine but both of them pair really well with the flavors of this chimichurri.