While the origins of the dish are very hard to pin point, one of them goes as follows:
On a typical dark, wet Glasgow night, a bus driver coming off shift came in and ordered _____. He sent it back to the waiter saying it’s dry. At the time, the cook had an ulcer and was enjoying a plate of tomato soup. So he said why not put some tomato soup. They sent it back to the table and the bus driver absolutely loved it. He and his friends came back again and again and the dish was put on the menu.
Which dish am I talking about?