Here is the recipe for the Groom's Cake. "Tiffin" or "Chocolate Digestive Cake" Ingredients: 3 oz of butter (3/4s of a stick of butter) 3 tablespoons of sugar 1 tablespoon of cocoa I egg I packet of Carr's whole wheat crackers (7oz) 1/2 cup of raisins 1/2 cup of walnuts. NB if you wish to omit the nuts, please add 5 more crackers .
Crush crackers. Melt butter and sugar in a saucepan. Add cocoa powder and egg and stir quickly. Cook until mixture boils. (Bubbles at edge of saucepan is sufficient) Stir in crackers, raisins and nuts. Smooth mix into a pregreased pan. (8" square or similar small size)) Let mixture harden in fridge until you can cut into bars and remove said bars from pan without them crumbling to pieces. Overnight is best if you can wait.
This should take a maximum of 15 minutes and has a truly nostalgic taste, summing up the best of British cooking. Lancelot makes it regularly for Agile and Wilfred. There have been some comments about the lack of an image. So here is a Patriotic Robin carrying a Groom's Cake. Please note, to get the layered look, it is necessary to double the quantities. Easily done and usually much appreciated.