Here is one that I use. Actually, I just chop the amount of parsley I think I am going to need and then adjust the other ingredients on the fly. Sometimes I use a little cilantro mixed in with the parsley.
1 bunch fresh parsley, chopped
1 - 2 cloves garlic, minced
3/4 cup olive oil
1/4 cup apple cider or red wine vinegar
1 tablespoons lemon juice (optional)
1 teaspoon kosher salt or 1/2 tsp table salt
1/2 teaspoon ground black pepper
1/2 teaspoon ground cayenne pepper (optional - I do not use)
I usually chop the parsley with a chefs knife, but you can do it with a food processor too.
Chop the garlic and then sprinkle the salt on it and use the side of a knife to crush it to a fine paste.
Put the parsley in a bowl and mix in the other ingredients.
Can be used immediately, but gets better if you let it stand for a few hours and keeps for several days in the refrigerator.