Dorian has no talent for cooking at all, but foods that are already prepared to be eaten are easily enough to plate. He's just highly coordinated, the mage doesn't really have any experience plating food himself, being a noble brat, but he's seen plated food so many times he could reinterpret it on a plate blindfolded.

"It pains me to think of what I would be missing out on if I stopped...perish the thought!" Dorian passes off the first plate to Midnighter before stooping down to the refrigerator yet again to check the beverage status, "water, or watered down ale?"