Whether a single meal of fish and cold grilled fish belongs to prefabricated dishes depends on the specific situation. Generally speaking, prefabricated vegetables are processed to some extent in the manufacturing process, and then packaged and provided to consumers. However, single meals of fish and cold grilled fish are usually cooked in restaurants, so they are not strictly prepared dishes.

However, the operation mode of the catering industry varies from business to business, and it cannot be generalized. Some restaurants may make some preparations in advance, such as preparing fish or preparing seasonings in advance to improve the production efficiency and food consistency. This process is called prefabrication, but the restaurant will still do the final cooking and plate loading on site. Therefore, it can be said that the single meal of fish and cold grilled fish has experienced the prefabrication process to a certain extent.

It should be noted that as consumers, we cannot directly know the specific operation mode of the restaurant. I suggest you consult the restaurant directly and decide whether it meets your definition and expectation of preparing food according to their explanation.