When making homemade salad dressings it is a good idea to use extra-virgin olive oil. It has a fruity flavor that really adds to a salad. Extra-virgin olive oil can be somewhat expensive so it is important to buy it when it is on sale or with a coupon to make it more affordable. Use oils for flavor. what is extra virgin olive oil. When using oil in uncooked sauces or dressing, be sure to use a high quality oil. The flavor of regular cooking oil will ruin your dish. Extra-virgin olive oil, with its fruity flavor, is a must for uncooked sauces such as aioli, or raw tomato sauce. A green salad will benefit from a simple dressing of extra-virgin olive oil and vinegar. Hazelnut and walnut oil have a delicate flavor that is suitable for 'light' dressings and sauces.