鬼も十八番茶も出花
おにもじゅうはちばんちゃもでばな
just as even coarse tea tastes good when fresh, even homely girls look beautiful at the peak of their youth
番茶も出花 is read as ばんちゃもでばな (bancha mo debana) and means even a homely girl looks beautiful at the peak of her youth.
ばんちゃもでばな
bancha mo debana
おにもじゅうはちばんちゃもでばな
just as even coarse tea tastes good when fresh, even homely girls look beautiful at the peak of their youth