
The lemon seems to be such a common, and essential, fruit, that you'd imagine it had been around since the beginning of time. Not so. The original three citrus plants, from which all others have been bred, are the citron, the mandarin and the pummelo. The lemon is probably a multi-step hybrid, involving the citron, the lime and the pummelo. Lemons arrived in Europe 1500-2000 years ago, having originated in what is now Pakistan and India, and coming via the Middle East.