Warlocks have minions. One minion, the imp, is on fire. I have my imp, Volham, out all the time due to my training. He provides a great crit buff when he crits.
Cooking needs a fire. It's very useful to have food buffs while in a raid.
I'd like to be able to cook over my imp. Summon imp, add a little salmon, some northern spices. Wah la! Firecracker Salmon!