Crisp or semi-soft wheat or oat biscuit made with dark sugar or syrup and strongly flavoured with ginger.
Gingerbread biscuits may have been especially prized by the English abroad, as a taste of home, as this advertisement reported in the 1910 'Argentina From A British Point Of View'; "LOST. - One tin of gingerbread biscuits (Huntley & Palmer). No reward is offered, as they will probably be eaten by the time this advertisement is in print. If anyone would return the tin, as a recuerdo, to Lucero, advertiser would be obliged." [recuerdo = keepsake]
Compare with: Ginger Nuts