Whisk the raw egg yolk and honey/sugar into 3/4 cup hot sake (hot enough to lightly cook the egg - 1:30 in the microwave).
An alternative preparation method is to heat the sake/egg/honey mixture together, while whisking occasionally.
Be careful to stop cooking before it turns into scrambled eggs.
Tamagozake(卵酒 or 玉子酒?) is a drink consisting of heated sake, sugar and a raw egg. It translates as "egg sake", being made of the kanji 卵 tamago (egg) and 酒 sake. Outside of Japan, tamagozake is sometimes referred to as sake-nog, due to its resemblance to eggnog.