1C cilantro stems
1/4 C water
1/4 lime juice(or lime/lemon or lemon)
1/4 C honey
1/4 dijon mustard
salt and pepper to taste
1 small clove of garlic peeled(optional)
Puree in blender til smooth, then through opening in top add olive oil slowly until the hole at the center of the dressing disappears. This is usually the proper amount of oil for a properly emulsified vinaigrette.
This website has some amazing salad dressing recipes!