Biscuit

A biscuit was a baked flour-based food often served with tea. (TV: The Invasion, Victory of the Daleks, The Last Precint)

Types of biscuits
The Second Doctor once asked for a patty cake biscuit with his tea. (TV: The Invasion)

Kirsty McLaren offered a wheat biscuit to Polly Wright, who mistook it for a dog biscuit. (TV: The Highlanders)

Sailors often ate hardtack, which they did not like. (TV: Enlightenment)

The Best company sold biscuits. (TV: Liberation)

The Seventh Doctor's favourite biscuits were chocolate HobNobs. (PROSE: Cold Fusion)

The Eleventh Doctor hated ginger biscuits (PROSE: Dead of Winter) but was very fond of Jammie Dodger biscuits. (TV: Victory of the Daleks)