Climb on the toilet, and then on a shelf to light the candle. Exit the room and go left untill you reach the bedroom. Sneak past the sleeping cook and climb on the shelf with the key. Hang on the key and start swinging to pull it down. Unfortunately, the sound will wake the cook, so quickly hide under the bed to avoid detection.
Once the grotesque character leaves the room, pick up the key and head right. Proceed to the elevator - pull the lever and take the elevator down. You'll be back in the kitchen - hold onto the key and quickly hide under the long table. Once the cook turns left, you can proceeed to the right untill you find a door with a padlock. Use the key to open them and quickly hide inside.
Quickly run under the table and proceed to the room with the meat grinder. For the time being, enter the small elevator located on the wall and take it up. Drop a hunk of meat from the cabinet and place it on the hatch. Then, climb on top of the cabinet, jump on the hook and grab the second hunk of meat. Same as previously, place the meat in the recess on the floor. Now, proceed to the next room through a gap in the wall and light the lantern.
Take the elevator down and jump on the lever. This will open the hatch and result in the pieces of meat landing on the grinder. Turn the lever and you will make some sausages - jump on them, swing and proceed to the shaft.