8 Steps for freezing herbs in oil~ the oil-and-freezer method of preservation works best with the tougher hard herbs such as rosemary, sage, thyme, and oregano. These are all herbs that would probably be cooked when added to a dish. Soft herbs such as mint, basil, lemon verbena, and dill are usually added raw to a dish, and they don't respond as well to this kind of preserving.
