This light, olive oil-based sauce is all you'll need to adorn that perfectly seared chunk of asado.
6 cloves garlic
1 white onion, finely chopped
2 bunches Italian parsley, stems trimmed
Juice from 2 large lemons
1/2 teaspoon crushed red pepper flakes
1/4 teaspoon cayenne pepper
1/2 cup olive oil
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
In a food processor, process the garlic and onion until well mixed. With the motor running, add the parsley, lemon juice, red pepper flakes, and cayenne. Add the olive oil, pouring in a slow, steady stream. Continue to process the mixture until it is smooth and quite thick, about 5 minutes. Use a rubber spatula to scrape the sauce into a bowl, add the salt and pepper, cover, and set aside.