Camping stoves?

Decorated Marie biscuits are always good for things judged on presentation, and with a camping stove you could make pancakes, french toast, pasta with sauce.

Without heat, you could have pre-boiled eggs and pre cooked bacon and/or chicken and make a caesar salad...or any other sort of salad.

...could you bring barbeques?

ETA: You could do a bit of experimenting, but boiled water in thermoses might cook things like couscous.

- Do you have access to electricity? Kettles, electric frypans?