I've just done two weeks camping with a one ring hob and bbq but I also have an electric frying pan and an electric kettle and a toaster ( could manage without that to be honest)
I hope you do have more than just the one job and a bbq. I'm a seasoned camper but I'd struggle with just that!
We cook- (there's four of us) :
King Prawns and a jar of tikka masala and pilau rice and poppodoms
Bbq paprika chicken with salad and rice
Pasta and bolognese ( again using a jar of sauce)
Chilli and rice ( the Nigella express version which uses spicy tomato pasta sauce and chorizo )
Lamb koftas with pitta , Greek salad and cous cous
Pan fried salmon with broccoli and cous cous
White fish with a jar of korma sauce rice and naan bread
A one pot tomato based rice with tuna and sweet corn that is a recipe passed down from DH's parents from their camping days - simple but tasty
Breakfast was scrambled egg and bacon with bagels , or pain au chocolate or instant porridge
Every other meal was at the pub , restaurant or fish and chips on the beach.