During the 19th century, Mexico experienced an influx of various immigrants, including French, Lebanese, German, Chinese and Italian, which have had some effect on the food. During the French intervention in Mexico, French food became popular with the upper classes. An influence on these new trends came from chef Tudor, who was brought to Mexico by the Emperor Maximilian of Habsburg. One lasting evidence of this is the variety of breads and sweet breads, such as bolillos, conchas and much more, which can be found in Mexican bakeries. The Germans brought beer brewing techniques and the Chinese added their cuisine to certain areas of the country. This led to Mexico characterizing its cuisine more by its relation to popular traditions rather than on particular cooking techniques.