I love chimichurri with my steak- it is such a fresh dipping sauce! All you need is the ingredients and a blender!
My sauce tonight had extra virgin olive oil, red wine vinegar, whole garlic cloves, parsley, cilantro, red pepper flakes, and salt and pepper. I rarely measure my ingredients, so just make it to your liking! I LOVE garlic, so I probably use quite a bit more than others would like. If you like it spicy, use more red pepper. The beauty of not measuring is you can just wing it until you think it tastes good and you can experiment with other ingredients. For an extra pop of freshness, just tear up some of the herbs and top your sauce with it.
I dipped my steak in the chimichurri and had roasted cauliflower for my side.