Jack had sat on the table as the Doctor was talking, glad that he remembered. He chuckled when the time lord was telling him about how he could feel his age. It was probably because of the fact that he was still regenerating? It was possible. Jack was touched when the time lord said that he missed the immortal, a grin coming across his features. Though hearing about the Doctor asking if he had fish and custard was new. He was use to him asking about fruits, not fish and custard. He nodded, "I believe so. Let me go see." And so Jack was off to see if he had what the Doctor was requesting. 
Returning about twenty minuteslater, Jack Harkness had returned with a tray that had a plate of fried fish, a bowl of custard, and a cup of tea. He set the tray on the table, "it seems I did. Tho ught yiy would like some tea as well though I dont know if you got a different tasteof tea flavor wise." Jack hoped he made enough for the Doctor.