I freeze casseroles, soup, macaroni cheese, cottage pie, bolognaise and chilli. Lasagne would be fine frozen, after all birds eye do it

Mac cheese freezes well so no reason why lasagne won't. Personally I wouldn't freeze rice, it is one of the biggest causes of food poisoning, if it isn't chilled down and frozen asap the bacteria levels will be sky high, likewise if not defrosted safely and reheated thoroughly it could make you ill. But I'm a bit funny about things like that, I won't defrost anything in the microwave (or cook in it, not sure why I keep it really).