A chef in a kitchen cuts a piece off of a large slab of rotating meat on a stick, probably lamb.
A human being is in a kitchen with meat in front of him.
If a chef who is also a human being  is in a kitchen and cuts a piece off of a large slab of rotating meat on a stick then the meat is in front of him.
A chef is human being with a profession.  Lamb meat is a kind of meat that a chef cut and cook.
A chef is human being and he is in the kitchen.