Some years ago I ordered an appetizer at a restaurant in Denver. It was shrimp in green sauce. It was fabulous. My waiter gave me some guidance as to what was in it. I managed to reconstruct it at home.
Remove the lower stems from a bunch of cilantro and put the bunch into the food processor. It took some doing to figure out the proportions of these remaining ingredients, but I started slow and built it up. Add the following:
juice of 1/2 a lime
1 Tbs white vinegar
2 garlic cloves, chopped fine
a splash of olive oil
a couple pinches of salt and pepper
This is where I started. Once you buzz this up you can remove it to a bowl to make further adjustments.