With part thereof he eateth flesh - That is, he prepares flesh to eat, or prepares his food.
He roasteth roast - He roasts meat.
Related Commentaries of Isaiah 44:16
Isaiah 44:16
16 He burneth part thereof in the fire; with part thereof he eateth flesh; he roasteth roast, and is satisfied: yea, he warmeth himself, and saith, Aha, I am warm, I have seen the fire: