■ Leeks are best used soon after harvest. Refrigerate in a plastic bag for up to two weeks.
■ Wash just before use. Leeks need to be washed well because soil is pulled up around the stem as they grow. There is almost always grit caught between the layers.
■ Leeks can be frozen in slices or whole lengths. Seal in airtight bags. For best quality, use within 3 months