The three kinds of pure meat are meat that you did not see being killed for you, did not hear from a trustworthy person that it was killed for you, and you do not suspect that the person killed it for you.
The "Vinaya Piṭaka" stipulates that Buddhist monks cannot actively seek "delicacies" (such as meat, fish, milk, cheese, rock honey, etc.) for themselves. If the food obtained from begging contains meat, it must be three kinds of pure meat before it is allowed to be eaten.
According to the "Mahāyāna Mahāparinirvāṇa Sūtra" and the "Brahmajāla Sūtra", Chinese Buddhism believes that vegetarianism is its fine tradition, and maintains and promotes it. Even the three pure meats are not eaten by monks.
In the "Vinaya Piṭaka", Shakyamuni established precepts requiring monks to refrain from killing and to refrain from actively seeking "delicacies" for themselves.
If we categorize food by its delicacy or coarseness, one type is considered delicacies (also known as good food or beautiful food) and the other is coarse food (also known as bad food or coarse and bad food). Foods containing these ingredients are considered delicacies, including milk, cheese, raw butter, cooked butter, and ghee; edible oils such as sesame oil, mustard oil, dulce de leche, castor oil, and animal fat; sugar products such as honey and rock honey; and fish and meat.
