This is an old Kraft recipe, kind of like a pizza roll up, this is a great way to use up some stale bread and make great appetizers. I'd say they could be made up to the point of cooking & then frozen to reheat at a later stage. If you use tomato paste, you may need to add a little water to combine.
Toddler DD wont normally eat pumpkin but she ate these no problem with some cream cheese & ham, also nice served with hommus. Found on Taste.com.au, I cheated & used canned corn but the recipe calls for fresh.