甘之如饴
With relish.
Lick one's chops.

eg：Tom tasted the dish and smacked his lips, saying: " Yummy! "

中英俚语俗语来源：文天样·正气歌：“鼎镬甘如饴，求之不可得。”

同义词：津津有味 With gusto.
反义词：苦不堪言 As bitter as gall.