Someone up thread was asking about camping stoves. One thing to think about is other means of cooking that you already have available to you.
Have you got a BBQ? Whether gas or charcoal - just make sure you have some fuel for it. (Ours comes out in the depths of winter for our "snowed in BBQ" on the green, and things cook fine on it just a bit slower due to the cold).
Do you have a wood burning stove that you can access the top of? (Not the kind stuck right back into a fireplace - the kind where it is out in the room). DMIL has one of these, and a large kettle on top of it all day long (very useful for washing up water, hot water bottle filling at night etc - and can be useful for tea when coming in from the cold outdoors). And she also often puts a pot with a stew on top to slowly cook, which makes lovely melty casseroles! Or even a tin of soup or stew or beans or something that needs heating through but no additions - could open the tin and put straight on the top. But be careful and use oven gloves as it will be hot when you take it off!!!
Do you have a wood burner of some sort in the garden? Can you cook food on that on skewers, tin foil packets on the embers, place a metal rack (eg. cleaned from the cooker grill) on the top and rest a pot/pan on that? Google things like backwoods cooking or cooking on camp or scouts cooking for ideas and even books in pdf format to download (or print off - even better if there are power cuts as you can just flick through then, when you actually NEED it).
Or stuff like "haybox cooking" - where you heat up food to boiling, and then insulate it well to allow it to slowly cook in its own heat - even if you don't have access to hay, you could fashion something using decent cookware (cast iron holds its heat well for this purpose) well insulated in a picnic bag/coolbag with towels closely packed around it to keep as much heat as possible in. (I know - normally coolbags are to keep things cold, but that's because you put the food/drinks in already cold and the insulation works against the heat outside on a sunny day - if you reverse the scenario, it works just as well!)
If it is a sunny day, you could even fashion a "solar cooker" of sorts with tin foil and cling film in a south facing window, although I've only ever used that to cook a marshmallow here.