Use the BBQ to take out the chef in Ep. 7: Glass Houses
Battlefield Hardline BYOB Achievement / Trophy Guide
After you exit the main House, you get to a Tennis area where a DJ is playing music. Behind the DJ is the chef with the BBQ. To kill the chef you need to shoot at the BBQ. He will stand there the whole time, except when you alert the enemies.
Sneak up or use silent takedowns to get to him. There is enough cover to avoid all enemies.