'A 95-year-old man enjoys cod-liver oil; his grandson does not. One day, while trying to breed a new species of apple in honour of his dead wife, his grandson comes over and is given his home-made muesli mixed with cod-liver oil in exchange for money for the movies. But since the grandson is unable to swallow it, the grandfather accompanies him to the movies. However, by leaving the oiled muesli in his mouth for too long, a plant grows on his face, which eventually produces the apple his grandfather wanted to invent.' (https://en.wikipedia.org/wiki/Undone_(short_story_collection))