From their website:
Tea was drunk for breakfast and after dinner when the family gathered in the parlor to play games or read. The Earl of Sandwich played cards into the night one night and got hungry so asked for some meat to be put between two slices of bread to have with his tea (well, perhaps he wasn’t really drinking tea at that moment!). But, the sandwich was invented! It would play a part in later years when afternoon tea became popular. Come to The Grand Tea room for tea, but you'll remember the sandwich's just like the Earl
Personal Experience: So I finally got to eat at the Grand Tea Room and it has instantly become one of my favorite places! We went on a weekday and got the full 2-hour experience called the 'Grand Tea' on the menu. It seriously felt like we had gone back in time. The service was exceptional too. We had something like a 5 or 6 course meal with delicious tea! I ordered the Crime of Passion which is a tropical green tea. This spot won't be for everyone, but if you're a tea lover and enjoy a meal and atmosphere brimming with Victorian touches, then I recommend checking this spot out!
Even the bathroom is adorable!