To make the garlic-rosemary oil, peel and cut the garlic into very thin slices. Pour the oil into a small heavy skillet or saucepan, add the sliced garlic and the rosemary, crushing the herb between your fingers as you add it, and warm over low heat. When the aroma rises and the garlic just starts to take on color (it should not brown), about 5-7 minutes, remove from the heat. Add the salt to taste and strain the oil into a small pitcher.
NOTE: The oil can be made up to 2 weeks ahead, cooled to room temperature, and stored in the refrigerator in a tightly sealed container. To enjoy the full flavor and fragrance of the oil, make sure to bring it to room temperature before using.