Most of the time, I just use an emulsion of olive oil and vinegar. Fresh lemon or lime juice is a good sub for the vinegar, and I actually prefer that when it's available for squeezing. Plus salt, pepper, and maybe other herbs and spices according to what you like. It's not for everyone, but my current fav is a dash or two of the Jamaican Jerk Seasoning from The Spice House.