Rinse the herbs and chop them finely.
Remove the seeds from the chilies and chop them finely. Remember to taste them and add little by little. It is easier to add more heat than to take it away.
Chop or press your garlic. I chopped mine, and next time I will chop it more finely or press it instead. I ended up with a few pieces that were too large.
Mix everything together and add the vinegar, oil, salt, and pepper.
I recommend making it 1.5-2 hours before you need it, so the flavors can blend into the oil. If you don't have time, let it sit and marinate for at least 10 minutes.
You can easily make the sauce the day before, but then it needs to be refrigerated.
Your chimichurri is ready to use and should not be heated. Just spread it on your grilled steak or on your bread or vegetables.
Enjoy.