2 to 5 minutes. According to the query IT Education Network shows that the hollow cabbage is relatively easy to cook, with a strong fire and stir-fry 2 to 5 minutes, if the stir-fry time is too long, not only will reduce the taste, but also make the hollow cabbage black, in addition, cleaning the hollow cabbage, you can use water to soak for a few minutes, and add the right amount of salt or lemon juice.