"This is the 'secret' Greek dressing recipe from the pizzeria that I work at. The recipe makes almost a gallon but can be scaled down easily. It can be used for picnics and travels very well, since it doesn't need to be refrigerated. This is the best dressing I have ever tasted, people offer to buy it constantly, but if we sold it we wouldn't be able to make enough to use in the restaurant!"
You have scaled this recipe's ingredients to yield a new amount (4). The directions below still refer to the original recipe yield (120).
In a very large container, mix together the olive oil, garlic powder, oregano, basil, pepper, salt, onion powder, and Dijon-style mustard. Pour in the vinegar, and mix vigorously until well blended. Store tightly covered at room temperature.