In a mixing bowl, combine the fresh lemon juice, dried oregano, minced garlic, kosher salt, and black pepper. Whisk thoroughly to blend the flavors.
While continuously whisking, gradually pour in the extra virgin olive oil in a slow, steady stream. Keep whisking vigorously until the dressing emulsifies into a smooth, well-incorporated mixture.
Use immediately or transfer to a sealed container and refrigerate for later use. Shake or whisk again before serving.