xekckafi lujvo

c1=x1 is a quantity of black coffee/coffee [beverage] served without cream or milk or sugar.

See also making coffee (=kafpra), espresso (=kafrspreso), coffee with dairy product (=ladyckafi).

In notes:

kafpra
cu1 makes coffee/produces a quantity of coffee drink/product cu2=ck1 by process cu3.
ladyckafi
x1=c1 is a quantity of coffee [beverage] with dairy [or similar] product/of type/composition x2=l2.
kafrspreso
x1=c1 is made of/contains/is a quantity of espresso [coffee beverage] from beans x2=c2 with crema x3 (the foam with a creamy texture that forms as a result of the pressure).