A lot of the time, you will not have fresh green beans to hand and you will be left with those that have been frozen in your freezer. Do not worry, these can still be boiled but it will take a little more time to prepare them. Place the frozen green beans in a pot with around a quarter cup of water and cook them over a medium heat until the water evaporates to effectively defrost them. Remove the green beans and set them aside while you sauté olive oil with garlic then return the green beans to the pan, ensure they are coated, and then cook until cooked through.