You are talking about fresh day lily. To learn how to make fresh day lily, go to Baidu Tieba: Day lily bar? You can check the production process there.

The steps are as follows: 1. Boil water, remove the stems of fresh day lilies, and blanch them in boiling water until 3-5 roots are about to bloom, usually 3-5 minutes. Be careful not to bloom all the flowers. The fresh flowering day lilies will become rotten and lose their crispness and sweetness when cooked. 2. Wash with cold water 2-3 times. 3. Add garlic or something and stir-fry like normal vegetables. The oil and salt are the same as ordinary vegetables. As for the dried day lily, put a handful of dried day lily in a bowl, pour boiling water and soak for about 10 minutes. When the dried day lily becomes soft, rinse it with water and wash it 2-3 times. Be careful not to rub it to cause the day lily to bloom. Just squeeze out the water slowly. You can make soups and stir-fries. Day lily tastes very sweet and crisp, and is very nutritious.