ginger nut 
(also ginger snap)
noun British
A hard ginger-flavoured biscuit.So far today I've had about 20 biscuits (caramels, ginger snaps and a few shortbread) and 2 litres of water....
- She also breezily said she wasn't having any dessert, before diving into her son's ginger ice cream with a ginger snap.
- Finely crush the ginger snaps in a food processor (or in a plastic bag, with a rolling pin).