This is an Asian pickled. This pickle is pretty common in Asian cuisine. Most countries have their own version but cooking method is similar, 1:1 ratio of white vinegar:sugar. It can be served as a Korean banchan too. I tried to use less sugar and the result was less satisfactory as it leans toward sourish.
This is great as an appetizer as the vinegar really increases your appetite. Not to say vinegar is good for us too. It said to control high blood pressure, improving digestive system, reduce urinary tract infections and diseases, strengthening bone, etc. You can do a search on the Web to read more benefits of vinegar. With this pickle, I finally found a delicious way to have a little vinegar everyday. Not to say cucumber, radish and carrot are good for us too. But got to warm you though, this has quite a lot of sugar in it, so if you are watching your sugar intake, be aware. Also, eat in moderation, a little bit in a day, not the whole thing in a day no matter how tempting it is.