Wash the French Beans in cold water. Top and tail them as you would normally do. Place them into boiling water and boil at a high heat for 2 minutes (known as blanching). Drain off the boiling water ad run them under cold water for a minute. Drain them well and dry with absorbent kitchen paper. Pack the blanched French Beans in a freezer bag separating usable portions with cling film. Place the labelled and dated bag in the freezer. They will keep for 3 months in a standard freezer.