Step 1: Place the garlic, salt, and black pepper in a mixing bowl and mash to a paste with the back of a wooden spoon.
Step 2: Add the oregano, hot pepper flakes, wine vinegar, and lemon juice and whisk to mix. Whisk in the olive oil in a thin stream, followed by the parsley, if using. Taste for seasoning, adding more salt and/or vinegar as necessary.
Step 3: You can serve the chimichurri right away but if you let it stand for an hour or so, the flavors will be better blended and richer.
Serve with the Buenos Aires “Heart-Stopper”.