Imagine this: its 1941 in Britain. War rages across Europe and the Blitz has disrupted food imports across the country. The bananas have vanished. Butter, eggs, and meat are tightly rationed. You’ve just turned the flower bed into a cabbage patch and are learning, for the first time, how to preserve your food without a fridge. It sounds worlds away from today’s oat-milk lattes and artisan...