Satsuma

Satsumas were a small variety of tangerine commonly found in Christmas stockings in Great Britain.

The newly-regenerated Doctor finds a satsuma in his pocket. (DW: The Christmas Invasion)

References

Following his victory over the Sycorax leader in a sword fight, the Doctor found a satsuma in his pocket and threw it against a switch on the hull of the Sycorax vessel. The Sycorax leader, who, in violation of the rules of combat, was about to attack the Doctor from behind and kill him, found the hull under his feet open up, and fell thousands of feet to his death. (DW: The Christmas Invasion) The satsuma ended up being kept in Leamington Spa Lifeboat Museum along with a Sycorax sword. (WEB: whoisdoctorwho.co.uk)
A beggar boy who was kidnapped by the Graske in 1883 said he was "saving up money for a satsuma". (DW: Attack of the Graske)