1. Preparation before cooking: After the vegetables are cleaned, drain the water to avoid discoloration due to excessive water during cooking. At the same time, it should be placed separately from other ingredients, so as not to mix the colors of other seasonings with vegetables and affect their color.

2. master the temperature of the pot: in the process of cooking, you need to heat the pot first, and then pour in the oil. When the oil is slightly hot, you can stir-fry the vegetables in the pot. If the pot temperature is too high, the vegetables will quickly change color when put in, which will affect its delicious effect.

3. Cooking time: Cooking time is also very important. Vegetables should be fried at high temperature for a short time to ensure the emerald green of vegetables. Usually, vegetables can be fried in the pot for 2-3 minutes, and the time should not be too long, otherwise the color will become darker.

4. Salt adding time: Pay attention to the salt adding time when frying vegetables. Usually, when the salt is put into the pot, the frying time should not exceed 30 seconds, otherwise the vegetables will easily drain and lose their emerald green. If you are worried about the discoloration of vegetables, you can put the salt on the plate first, and then shake the salt on it after the vegetables are fried.

5. Time to add garlic: Adding garlic to stir-fry vegetables can increase the flavor and taste of vegetables, but it is also necessary to master the time of addition. Usually, you can fry vegetables for 1-2 minutes, then add garlic and fry for about 30 seconds to avoid discoloration of vegetables for too long.