Chimichurri tends to come in two versions in most Argentine restaurants - the "green" version above, and a "red" version, which I tend to like better. Thought I'd contribute the recipe for the red one that I like to use:
1/2 cup oil
1 cup warm water
1/2 cup vinegar
1/2 cup white wine
1 teaspoon salt
2 cloves garlic, minced
2 tablespoons parsley, finely chopped
1 scallion, chopped
1 small tomato, peeled, seeded, and chopped
1 small sweet pepper, finely chopped
1 teaspoon paprika
1/2 teaspoon cumin
1/2 teaspoon ground pepper (or chili powder if you want spicy)
1/2 teaspoon oregano leaves
2 bay leaves
Basically, mix all the ingredients together and let it steep for at least 12 hours before using, shaking it up every few hours. It should be used within a couple of days as the freshness of the flavors will fade quickly.http://www.saltshaker.net