Making Your Own Flavored Oils - The Atlantic Food Channel
http://food.theatlantic.com/home-cooking/quick-improvised-flavored-oils.php

How to create a quick infused olive oil.

This is a great method for making small amounts of flavored oils for use at the last minute as embellishments for soups, vegetables, and simple fish dishes. It works best with soft, fresh, fragrant ingredients like tender herbs, garlic, or grated citrus zest. Extra-virgin olive oil, subtly infused with lemon zest, is one of my favorites. There is no set formula for making these oils. The ratio of flavoring to oil will depend on the intensity of the ingredients you choose. Since they flavor the oil quickly, you can taste and add more flavorings, if you wish. These oils are splendid on many foods -- practically anything you would dress with olive oil.