Yak burgers, fat and cabbage hearts (3)
I believe the answer is:
gab
'yak' is the definition.
(I know that yak can be written as gab)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for gab that I've seen before include "The Irish are said to have the gift of it" , "Loquacity the gift of it" , "The gift of the - means verbal fluency" , "Talk at length, chatter" , "The gift of the . . . is ability to talk fluently" .)