Method: 1, blanch bitter gourd in hot water with salt, not for too long, until the color of bitter gourd becomes darker.

2. Put it in cold water to cool and drain. Heat the oil in the pan, put the green pepper into the wok, add bitter gourd, salt, chicken essence and chopped green onion and stir fry a few times.

3, (need to fry quickly in a hot oil pan), will not turn yellow.

4. Use an insulated barrel to prevent air contact and yellowing.

Second, the color change when frying bitter gourd is because the oxidation of bitter gourd and chlorophyll will change color when heated.