Over 150 million years old, ginkgo trees, also called maidenhair trees, are one of the oldest variety of trees on earth. The light yellow-green flesh of the ginko nut is covered by a thin yellow skin (called a pellicle) and a smooth, hard white shell. In China, the ginkgo is considered auspicious and often found around temples; the seeds are colored red and served at weddings. In Japan, ginkgo nuts are a popular grilled on skewers or in the egg custard, chawan mushi. Ginkgo nuts are available fresh and also canned or in jar.