Generally speaking, the uncooked water of red beans and barley will not cause any substantial harm to the human body after drinking, so it can still be drunk, but it is usually recommended to drink it after boiling.
Coix seed is not toxic when eaten raw, but the cooked Coix seed is not biased, which is more suitable for human intake. Red beans are also best cooked, and the alkaloids in them are destroyed before eating. So if you don't just boil water to drink, it is recommended to cook for a certain period of time, so that red beans and barley are cooked before eating.
How long red beans and barley are cooked depends on how they are eaten.
When making red bean and barley water, the cooking time is mainly determined by the eating method. If it is only used for boiling water, it is recommended to boil the water for about 20 minutes, but the red beans and barley have not softened yet, so drinking water is the main thing, and eating red beans and barley is not recommended.
If you want to eat red beans and coix seed together with water, it is best to cook them for about 1 hour, because only in this way can they be cooked thoroughly, which is beneficial to the digestion and absorption of the stomach.
Red beans and barley are green when cooked. Can you still drink? It depends on the specific situation. If it goes bad, you can't eat it.
Under normal circumstances, the red bean coix seed should be red after cooking, and the green color may be influenced by anthocyanins, which are water-soluble natural pigments and blue-green in alkaline environment. If you add anthocyanin-containing ingredients to the water of red bean and coix seed and cook them together, the water may turn green, which can be eaten continuously.
However, if it turns green due to deterioration, this kind of red bean and barley water can no longer be drunk, because this kind of water has usually been invaded by microorganisms such as oxidation or bacteria, which may cause discomfort after eating.
4 red beans and glutinous rice are cooked several times. It is recommended to cook it twice or so.
When red beans and barley are boiled and drunk, it is recommended to cook them twice or so, because when they are cooked for the first time, there will still be more nutritional residues in them. It would be a waste to throw it away directly at this time. If you don't eat it directly, it is recommended to cook it again.
Of course, you can't boil water too often. If it is more than twice, the efficacy of the red bean and barley water may be weakened and the taste will be affected, so cooking it twice is almost the same.