1, bird's nest stew. First of all, look at the appearance: the stewed bird's nest will be integrated with the soup because of sufficient water and gradually sink to the bottom. The appearance looks completely transparent, like crystal jelly, while the appearance of immature bird's nest is white and will not blend with water.

2. Smell: Because of the high content of protein in bird's nest, the stewed bird's nest will give off a faint smell of boiled eggs. If you don't smell this fragrance when stewing, it means that the bird's nest is not cooked.

3. Taste: Immature bird's nest tastes crisp and full of Q-bombs, which tastes a bit like vermicelli, while cooked bird's nest tastes slightly soft and elastic, silky and refreshing, and its hardness is more like eating jelly. If cooked for a long time, it's almost like eating snow swallow.