Very similar to the old double terra cotta pot system. Need something similar, larger, and colder. Hers only keeps cold to about 45 degrees F. Amazing solar-powered fridge invented by British student in a potting shed helps poverty-stricken Africans
"She had intended omelettes for the two of them, but now she took lamb chops from the fridge, scrubbed new potatoes, baby carrots and added to the broad beans. These on the Aga, she turned her attention to a pudding. Egg custards with plenty of cream…"