I'm mostly posting this here so I don't lose it again but this is really, really good dressing. I think there's a bunch of Costa Vida resturants out west but I went to the one in Portland, ME and am now hooked!
Put all ingredients in the blender and blend well. If you like it a little more mild, use less cayenne pepper and less of the jalepeno seeds. I usually only use 5-6 seeds & a tiny piece of the core. My mom uses the whole pepper seeds and all.
"Cooking" time does NOT include chilling time - chill in fridge for at least 2 hours to let the flavors meld.