Add in the other ingredients and shake or whisk well. For best results, let the dressing sit overnight. (Read more about this here.) After using, store the leftover dressing in the refrigerator for up to four days.
1 cup extra virgin olive oil, 1/2 tablespoon Dijon mustard, 2 garlic cloves, 2 teaspoon sugar, 1/4 teaspoon black pepper, 2 teaspoons oregano