Place the avocado, red wine vinegar, lemon juice, Dijon mustard, dried oregano, and salt and pepper in the container of a high-speed blender.
Blend the dressing, adding a few tablespoons of water at a time, as needed, until the dressing reaches your desired consistency. Taste and adjust the seasonings, as desired.
Use right away, or refrigerate in an airtight container for later.
Notes
For the nutritional information, a serving is about 1 tablespoon.This dressing will keep refrigerated for 3 to 4 days.