Add salt and sugar. Add cider vinegar and mix gently. Cover and let stand at room temperature for six to eight hours. If possible, mix gently every few hours. Cover tightly and refrigerate.
Crispness develops for several days.
Keeps well for over a month. Try experimenting with flavorings other than ginger such as garlic, dill, chili peppers etc. Also, try other vinegars such as tarragon, rice or balsamic.