Whether it’s tossed into a big green salad with kalamata olives and feta or poured over a gluten-free pasta salad, this vinaigrette adds bright, zesty flavor.
Place olive oil, red wine vinegar, lemon juice, mustard, garlic, and salt in a quart-size mason jar (if using immersion blender) or countertop blender container.
If using an immersion blender, position the blade at the bottom of the jar and draw it upwards to form an emulsion. (An emulsion is when the dressing become thick and creamy.)If using a countertop blender, blend until well-combined. This will yield a thinner, traditional vinaigrette consistency.
Add in freshly-ground black pepper and oregano, then pulse to combine.