While some fruits and vegetables contain natural pigments, these are not strong enough to significantly lighten hair color. Many home remedies for hair lightening use lemon juice, which contains citric acid. This acid can help lift some color from the hair, but it's not a reliable method and can damage your hair if used incorrectly.
If you're looking to lighten your hair, it's best to consult a professional stylist. They can help you choose the safest and most effective method for your hair type and desired outcome.