Eggs: contain large amounts of cysteine, which breaks down the hangover-causing toxin acetaldehyde.
Vegemite: replenishes the sodium that left your body as urine the night before. Coconut water or sports drinks also work.
Fruit juice: replenishes the glucose that left your body as urine the night before.
Nomikata: a plum flavored morning-after drink filled with the goodness of 600 shijimi (cockles) worth of amino acid.
Mukae Zake: good old hair of the dog.