Celery and/or carrots
Wow, David, I've never heard anybody say they consider celery a comfort food! I'm impressed. For me carrots and celery are Diet Torture Foods.
Other than that, I like most of the foods people have mentioned. Chrissi, I've never heard of "malt candies." Do they have them here? Would I like them about as much as you like marshmallows?
Kelda, are "mushy peas" a particular dish, like "mashed potatoes," or are they just peas that happen to be mushy? And is deep-fried pizza supper just what it sounds like? Pizza that's been deep-fried??
My favorite comfort food is probably garlic mashed potatoes. But I like potatoes in almost any form. Also, bread, pie, ice cream, in fact most desserts, pizza, pasta, anything with melted cheese ...
As far as I'm concerned, the five food groups are: fat, sugar, starch, alcohol, chocolate.