Unusual way to serve beef? (4)
I believe the answer is:
rare
'unusual' is the definition.
(rare can mean unusual or odd)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "difficult to find?" , "like gold dust" , "Very infrequent, lightly cooked" , "Seldom seen or met" , "Especially good" .)