Mixed Grill is a magazine story.
The Fat Controller sent Thomas to make some deliveries. At the first stop, some sausages were unloaded from the train. The fireman remarks that toad-in-the-hole is his favourite dinner. Thomas was surprised until the driver explains that there's no real toads in it. At the next station, the driver off-loads trays of eggs. The driver remarks that eggs in bed is his favourite breakfast. Again, Thomas is puzzled, but the guard explains that it's only fried eggs in bread.
At Wellsworth, bacon and sausages were unloaded. The snack bar owners tells Thomas' crew that hot dogs are his best seller! Thomas' driver quickly explains what a hot dog is to Thomas before the tank engine starts to worry! By midday, Thomas arrived back at the main station, where the Fat Controller watches Thomas' delivery with interest. The Fat Controller explains that "mixed grill" is his favourite and it is lunchtime!