Focusing on the taste:
* The cocoa was as smooth as velvet on my tongue.
* The chocolate was as rich and satisfying as a warm hug.
* The cocoa was as sweet and comforting as a lullaby.
Focusing on the appearance:
* The cocoa was as dark and inviting as a starless night.
* The cocoa was as thick and creamy as a whipped dream.
* The cocoa was as brown and beautiful as a polished mahogany table.
Focusing on the scent:
* The cocoa smelled as warm and inviting as a crackling fireplace.
* The cocoa had a scent as rich and intoxicating as a blooming flower.
* The cocoa smelled as comforting and nostalgic as a childhood memory.
The best simile for you will depend on the specific aspect of cocoa you want to emphasize.