Wash, dry and chop all of the herbs: fresh parsley, fresh cilantro and fresh oregano.
Finely mince the garlic and shallot.
Add the garlic, shallot, vinegar and salt to a bowl, mix and allow to sit for 15 minutes.
Then add the parsley, cilantro, oregano and jalapeño and olive oil.
Whisk with a fork and serve with a spoon to ladle over the meat or vegetables.
If specifically a chimichurri sauce recipe for steak follow the marinading and proportion serving sauce recommendations below.
Recommendation for Chimichurri sauce recipe for steak: Take 1/2 cup and place it aside to serve with the finished meat. Use the remainder as a marinade. Cover all sides of the steak in marinade, cover and refrigerate for a minimum of 3 hours or over night. Spoon excess marinade over the steak while it is cooking. After the steak has rested for 10-15 minutes, slice and then serve with the sauce that you have set aside to be spooned over the steak.