Kaf

From A Wheel of Time Wiki

Kaf is the Wheel of Time analog to coffee.  It is a dark and bitter drink brewed from beans and is popular (and exclusive) among the Seanchan.  Westlanders who drink kaf tend to think of it as undrinkable and that no amount of honey could possibly salvage the taste.  Seanchan, on the other hand, find tea to be an extremely weak and unflavorful beverage by comparison.