Technically this is a missable achievement as you can kick the door down and progress without collecting the items needed for this to unlock.
It’s in a room halfway through Chapter One: Fresh Meat, Kitchen. It looks like a buffet bar with a big island in the middle and a load of imps working behind chains off to the bottom left. Just after you collect the Russian Rifle.
Clear the room out then talk to the one imp that you can interact with and he’ll tell you to collect three things. They are all on the floor circling the big buffet bar in the middle.
Take them back to the imp and he’ll say he’ll cook it. Clear out the next wave of enemies. After finishing them off go back to the imp and collect the BBQ steak.