Why are the cold beans in the restaurant so delicious? I'll tell you the methods and techniques

Why are the cold beans in the restaurant so delicious? I'll tell you the methods and techniques.
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Cold mixed beans are a dish made mainly from beans, salt, sugar, and other ingredients. It has the function of strengthening the spleen and stomach, can tonify the kidneys, and is suitable for symptoms such as qi stagnation, hiccups, chest tightness, and low back pain.