Sentence:  ‘And if I'm late for supper there's a dish of macaroni cheese you must put in the oven and a tin of tomatoes to eat with it. And there's a little rhubarb and <WSD>shape</WSD>.' 
Meaning of the word marked with <WSD> tags:  A mould for making jelly, blancmange etc., or a piece of such food formed moulded into a particular shape.