The blanching time of cold lotus root slices depends on the thickness of lotus root slices and personal taste preference for ingredients. Usually, it takes 1-2 minutes to ripen lotus root slices. When you blanch the lotus root slices in boiling water, you can observe that the lotus root slices become transparent, which indicates that they have softened and matured. It is suggested that you check the taste of the lotus root slices in about 1 minute. If it is not ripe enough, you can blanch it for another 30 seconds or 1 minute until the lotus root slices reach your favorite maturity. Remember to pick up the lotus root slices immediately after blanching and put them in cold water to stop the cooking process.