for edible by everyone, a simple syrup (sugar dissolved in water) will do
you can flavor the syrup to complement the flavor of the cake.
for an adults only version: soak with
rum (regular, spiced or golden--my fav.: Appleton Gold)
Bailey's Irish Creme
Kaluha (can we say mocha?)
any flavored liquere (whooo boy, the possibilities!!!!!)
flavored vodka (or plain if you insist)
anisette (not in mine ya don't! hate black licorice taste)
and totally goofy opition: Everclear...warning, you car could go up in flames w/ this stuff if the candles burn to short!