Final answer:
The boys' first meal on the island was fruit from the trees, which is a common theme in literature where characters are stranded and must initially rely on readily available natural food sources.
Step-by-step explanation:
The first meal that the boys had on the island was fruit from the trees. The question references a scenario that is likely from a novel or a story where characters are stranded on an island, mirroring situations in literary works such as 'Lord of the Flies' by William Golding. In such fiction, characters often turn to the natural resources available to them, which typically include fruits, berries, or other edible plants. As they adapt to their new environment, they rely on the land's bounty for sustenance before they develop the means to hunt or cook.