What fruit is associated with Newton's theory of gravity?

Legend has it that Isaac Newton formulated the gravitational theory in 1665 or 1666 after watching an apple fall and asking why the fruit fell straight down rather than sideways or even upward. According to Martin Rees -a former president of Britain's Royal Society, which was once headed by Newton himself- Newton showed that the force that makes the apple fall and that holds us on the ground is the same force that keeps the moon and planets in their orbits.

Source: National Geographic