Japan's Soul Food "TKG" Tamago Kake Gohan (= TKG), Japan's soul food made by mixing raw egg with rice, the staple food of Japanese people, has arrived. Eating eggs became common in the Edo period, and since eggs were highly nutritious yet still precious, they were treated as medicine. It is said that eating Tamago Kake Gohan began in the Meiji period. It's surprisingly a food with a long history. Japan's unique culture of eating raw eggs. While there isn't much of a custom of eating raw eggs overseas, many visiting tourists seem eager to try it.