Sherbet lemon
From Tardis Wiki, the free Doctor Who reference
Sarah Jane Smith kept sherbet lemons in her glove compartment. (AUDIO: Kaleidoscope)
When Evie Hubbard sent the Twelfth Doctor a selfie as a present for helping her getting an A at school, the Doctor wondered if they made sherbet lemons any more. (TV: The Woman Who Lived)
The Second Doctor once offered Jamie McCrimmon a sherbet lemon. (TV: The Wheel in Space)