I'm thinking you meant to call that a
roulade...
Anyway, with kids as the judges, I think you're screwed if you try anything exotic. My suggestion would be to find a standard meatloaf recipe and try to perfect it. Make it in a pan... You don't want to use too much meat, or mix it/pack it too thoroughly, as either will render it hard as a rock. You want some sort of sauce on top... kids like ketchup, although I tend to favor something a little more complex. Just don't make it too weird for them...
Some TV chef recipes:
Meatloaf… meatloaf recipes from chefs on TV | What's Cooking on TV
EDIT: I'd suggest one of the last three recipes. Use good, fresh ingredients. Make your own breadcrumbs, etc.
Good luck,
JR