Dunking is first reported with ancient Romans softening their hard unleavened wafers (Latin: "bis coctum" – "twice baked") in wine. Modern day dunking has its roots in naval history when, in the 16th century, biscuits known as "hard tack" were on board Royal Navy ships, which were so hard that the British sailors would dunk them in beer in order to soften them up. The most popular biscuit to dunk in tea in the United Kingdom is McVitie's chocolate digestive. In the US, Oreos are frequently dunked in milk, while the Dunkin' Donuts franchise is named for the practice of dunking doughnuts into coffee. In South Africa and in India, rusks are a popular food for dunking in both tea and coffee. In the Netherlands, stroopwafels are commonly dunked in tea or coffee, often after having been set on above the hot drink for a few minutes to melt the caramel inside. In Nigeria, bread is commonly dunked in tea or coffee, while Acarajé is dunked in pap. In New Zealand gingernut biscuits are commonly dunked in tea or coffee.