Black beans in vinegar are usually raw black beans, of course, cooked black beans are also available. The practice of this food is to put the black beans into a pan, followed by cooking on medium heat, slow cooking for about ten minutes, put the cooked black beans into a bottle, add brown rice vinegar and wait for the black beans to absorb the vinegar.

When choosing black beans, pay attention to the following points. Generally speaking, the appearance of good black beans is not very uniform in size, there are large and small, the color is not pure black, some black beans ink black, some black in red. Fake black beans are dyed and processed, more black, the size is also very uniform, man-made traces of processing is more obvious.

Put the black beans into the vinegar, if the white vinegar becomes red, such is the pure black beans, if the color of the vinegar remains unchanged, such black beans are fake black beans. The reason why black beans put into white vinegar will make the vinegar change color is because there are anthocyanins on the surface of black beans, which will cause the white vinegar to change color.

After the black beans are peeled, one kind is yellow-kerneled and the other is green-kerneled, and the black kidney beans sold on the Internet nowadays are not real black beans.

Buy back the black beans if you can't eat it all, it is best to turn into a sealed jar to save, put in a cool place, do not let the direct sunlight, so you can better preserve the quality of black beans.