The credit for this pie's invention is claimed by Nigel Mackenzie and Ian Dowding, the owner and chef, respectively, of The Hungry Monk Restaurant in East Sussex, England. They claim to have developed the dessert in 1971 by amending an unreliable American recipe for "Blum's Coffee Toffee Pie". Though the restaurant is now closed, it is available in eateries across the world. Name this pie.