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The color of bone marrow?
Iron in bovine bone marrow becomes the color produced by ferrous ions in liquid.

When cooking beef bone soup, you need cold water. If hot water is poured into the pot at the beginning, the surface of the meat is suddenly exposed to high temperature, and the outer protein of the meat will solidify immediately, so that the inner and outer protein can not be fully dissolved in the soup. ?

Cow bones are hard, so it is difficult to cut a kitchen knife at home. You'd better let the merchant do it for you when you buy it. Because beef and beef bones are bloody, it is not easy to boil foam directly in the soup pot, which will eventually make the soup smell fishy. Therefore, it is necessary to fly water in advance and clean it to ensure that the final soup tastes mellow. ?

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Precautions:

When drinking beef bone soup, it is best not to eat it with spinach, because spinach contains a lot of calcium oxalate, which will react chemically with some ingredients in beef bone soup, thus affecting the normal absorption of nutrients by the body, and long-term consumption may lead to malnutrition.

Because beef bone soup is a high-calorie food, it is not suitable for obese people and people who are losing weight. Moreover, the fat content of beef bone soup is not low. If you want to lose weight quickly, you'd better not drink beef bone soup at this stage. On the contrary, you will gain weight.

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