1. Look

The shells of high-quality and fresh pecans all have a relatively uniform natural color. The carya cathayensis sarg is dark red, and the meat is light yellow. The shells of poor-quality pecans or aged pecans are dark and the meat color is dark.

2. Smell

Smell is the best way to distinguish new pecans. Fresh pecans will have a strong original flavor after opening the package; The old goods only smell of essence. If you open the package and smell a "smell of oil consumption", it means that the pecan has gone bad and should not be eaten.

3. Taste

High-quality pecans have thin shells and full meat. When they are bitten open, they give off a strong pecan flavor, which is fragrant and crisp to eat. Poor quality pecans do not have this fragrance, and the meat quality is dim or even black, and the deteriorated pecans will have a "fuel consumption smell".

Extended information:

Nutritive value of walnuts:

Nutritive value of walnuts is extremely high, which is rich in monounsaturated fatty acids, polyunsaturated fatty acids, lecithin, vitamin E and so on. Monounsaturated fatty acids and polyunsaturated fatty acids can reduce the contents of cholesterol, triglyceride and low density lipoprotein in blood and prevent hypertension, coronary heart disease and hyperlipidemia.

vitamin e has the functions of improving immunity, resisting arteriosclerosis, preventing cancer, protecting eyesight and eliminating "senile plaque". Therefore, walnuts are a good nutrition for the elderly.

Chinese medicine believes that walnut kernel is sweet and warm, and has the effects of tonifying kidney and strengthening yang, moistening lung and relaxing bowels. Therefore, people with symptoms such as cold pain in waist and legs, frequent micturition, tinnitus, sexual dysfunction, nocturnal emission, premature gray hair, etc. caused by kidney deficiency should insist on eating walnuts every day, which can play a therapeutic role.

There are many ways to eat walnuts. Apart from directly cracking them, amber walnuts and salted walnuts are good choices. Usually, you can cook some walnut porridge at home, cook porridge with glutinous rice, add walnut kernel and jujube after the pot is boiled, and cook for about 1 minutes.

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