Combine lemon juice, red wine vinegar, garlic, oregano, salt, and pepper in a medium bowl. If using Dijon mustard, add it now. Let sit for 5 minutes to mellow the garlic.
While whisking continuously, slowly drizzle in the olive oil until the mixture is emulsified and slightly thickened. Alternatively, combine all ingredients in a mason jar and shake vigorously.
Taste the dressing and adjust seasonings as needed, adding more salt, lemon juice, or optional honey to balance flavors.
If using fresh herbs, gently fold them in now to preserve their color and flavor.
Transfer the dressing to a glass jar or airtight container and seal tightly.
Refrigerate for at least 30 minutes before serving to allow flavors to meld together.
Before using, let stand at room temperature for 5-10 minutes (as olive oil solidifies when cold) and shake well, as separation is natural.
