1/2cupneutral-flavored salad oil (such as sunflower or safflower)
3tablespoonsfreshly-squeezed lime juice
1tablespoonapple cider vinegar
1/2teaspoondried Mexican oregano
Freshly ground black pepperto taste
Measure ingredients into the bowl of a mini food processor (or blender). Pulse until well-blended and emulsified. Taste and adjust seasonings, adding more salt and pepper if necessary. (Alternatively, you may measure all ingredients into a jar with a tight-fitting lid and shake vigorously, OR whisk the ingredients together in a bowl.)
Store leftovers in a sealed container in the refrigerator; allow to come to room temperature and shake well before using.
If you don't have Mexican oregano on hand, you may substitute regular (Mediterranean) oregano.