I think you need to make a clear division between food that was on ration and food that wasn't.
When you see a photo of food rations, this is only the ration of food that was rationed, if you see what I mean. the rationed foods were supplemented by all the food that were off ration - fruit and veg, fish, bread, and most people had access to supplemental food; home grown, foraged, gifted or extras a friendly food retailer would pass on to favoured customers. You did better in the country than the town.
My dad was the British Liaison Officer on a USAF facility in Somerset. He used to drive round all the local farmers when they complained about low flying aircraft, upsetting their cows.
The farmers soon discovered my fathers love of bread, cheese and cider, and as he drove down the farm drive they would disappear into a barn to pull a jug of strictly illicit home brewed cider, while the farmer's wife produced some equally illicit home made cheese and butter, plus a freshly made loaf.
In the days before drink driving regulations, he would drive back to his office in the afternoon, sit at his desk and fall asleep while he recovered from the (strong) cider he had imbibed.