Cook a green and good green bean soup, prevent reddening methods are as follows:

1, cook green bean soup with a little lemon juice or white vinegar?

This is to neutralize the acidity and alkalinity, and the soup comes out very green.

2, wait for the water to boil before adding the green beans?

Don't put cold water in the pot, but boil the water and then put the soaked green beans in the pot.

3, cooking green bean soup must be covered?

Must be covered to cook, the less contact with the air, the better.

4, use more pressure cooker, avoid using iron pot?

The shorter the cooking time, the more sealed, the more it can keep the green, so use the pressure cooker to cook out of the green bean soup tends to keep the green, avoid using the iron pot.

5, with pure water to cook green bean soup

If you use pure water to cook green bean soup, not only pouring out of the turquoise color, put a long time will not change color, or turquoise. This is partly related to the pH of the water, and partly related to the trace ions in it.

Tap water in the north is alkaline water, cooking green bean soup after the discoloration is particularly fast, after pouring out green bean soup, within two minutes you can see the obvious color change.

Expanded

Green bean soup is a green bean and water as the main ingredients boiled into the soup, has a heat detoxification, quench the thirst of the efficacy of the summer. Mung bean soup is richer in nutrients and is a type of soup with higher economic and nutritional value.

The principle of mung bean soup turning red is very simple, is the mung bean soup from the mung bean epidermis part of the dissolved phenolic substances in the air under the action of oxygen oxidation polymerization results. So open the lid to cook green bean soup easy to change color, with pressure cooker to cook green bean soup is not easy to change color.

Cooking green bean soup and water quality also has a relationship, the higher the alkali content of the water, the heavier the red. For example, the water in the north is harder to put more nitrile, so it is easy to cook green bean soup red.

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