The last step for my taco dinner was to chop some lettuce. My heart sank as I pulled the head of lettuce out of its bag. The green leaves glittered with a grainy shininess — ice. The fridge had frozen my lettuce.

Not too hopeful, I peeled two leaves off and ran them under the tap to wash them. As the frozen burst cells warmed up, the leaves melted into a green ooze. Sighing, I squeezed the water out and put the ooze and the head of lettuce into the bin.

Luckily, I had a backup cucumber.